aboutsummaryrefslogtreecommitdiffstats
path: root/acinclude.m4
blob: b9be1d29ebc46012f95d1c143e281922ed802501 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
dnl Macros that test for specific features.
dnl This file is part of the Autoconf packaging for Wireshark.
dnl Copyright (C) 1998-2000 by Gerald Combs.
dnl
dnl This program is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU General Public License as published by
dnl the Free Software Foundation; either version 2, or (at your option)
dnl any later version.
dnl
dnl This program is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dnl GNU General Public License for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the Free Software
dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
dnl 02111-1307, USA.
dnl
dnl As a special exception, the Free Software Foundation gives unlimited
dnl permission to copy, distribute and modify the configure scripts that
dnl are the output of Autoconf.  You need not follow the terms of the GNU
dnl General Public License when using or distributing such scripts, even
dnl though portions of the text of Autoconf appear in them.  The GNU
dnl General Public License (GPL) does govern all other use of the material
dnl that constitutes the Autoconf program.
dnl
dnl Certain portions of the Autoconf source text are designed to be copied
dnl (in certain cases, depending on the input) into the output of
dnl Autoconf.  We call these the "data" portions.  The rest of the Autoconf
dnl source text consists of comments plus executable code that decides which
dnl of the data portions to output in any given case.  We call these
dnl comments and executable code the "non-data" portions.  Autoconf never
dnl copies any of the non-data portions into its output.
dnl
dnl This special exception to the GPL applies to versions of Autoconf
dnl released by the Free Software Foundation.  When you make and
dnl distribute a modified version of Autoconf, you may extend this special
dnl exception to the GPL to apply to your modified version as well, *unless*
dnl your modified version has the potential to copy into its output some
dnl of the text that was the non-data portion of the version that you started
dnl with.  (In other words, unless your change moves or copies text from
dnl the non-data portions to the data portions.)  If your modification has
dnl such potential, you must delete any notice of this special exception
dnl to the GPL from your modified version.
dnl
dnl Written by David MacKenzie, with help from
dnl Franc,ois Pinard, Karl Berry, Richard Pixley, Ian Lance Taylor,
dnl Roland McGrath, Noah Friedman, david d zuhn, and many others.

#
# AC_WIRESHARK_ADD_DASH_L
#
# Add to the variable specified as the first argument a "-L" flag for the
# directory specified as the second argument, and, on Solaris, add a
# "-R" flag for it as well.
#
# XXX - IRIX, and other OSes, may require some flag equivalent to
# "-R" here.
#
AC_DEFUN([AC_WIRESHARK_ADD_DASH_L],
[AX_APPEND_FLAG(-L$2, $1)
case "$host_os" in
  solaris*)
    AX_APPEND_FLAG(-R$2, $1)
  ;;
esac
])

#
# AC_WIRESHARK_PUSH_FLAGS
#
# Push our flags to CFLAGS/etc.
#
AC_DEFUN([AC_WIRESHARK_PUSH_FLAGS],
[
  ac_ws_CPPLAGS_saved="$CPPFLAGS"
  ac_ws_CFLAGS_saved="$CFLAGS"
  ac_ws_CXXFLAGS_saved="$CXXFLAGS"
  ac_ws_LDFLAGS_saved="$LDFLAGS"
  CPPFLAGS="$WS_CPPFLAGS $CPPFLAGS"
  CFLAGS="$WS_CFLAGS $CFLAGS"
  CXXFLAGS="$WS_CXXFLAGS $CXXFLAGS"
  LDFLAGS="$WS_LDFLAGS $LDFLAGS"
])

#
# AC_WIRESHARK_POP_FLAGS
#
# Restore user build flags.
#
AC_DEFUN([AC_WIRESHARK_POP_FLAGS],
[
  CPPFLAGS="$ac_ws_CPPLAGS_saved"
  CFLAGS="$ac_ws_CFLAGS_saved"
  CXXFLAGS="$ac_ws_CXXFLAGS_saved"
  LDFLAGS="$ac_ws_LDFLAGS_saved"
])


#
# AC_WIRESHARK_BREAKLOOP_TRY_LINK
#
AC_DEFUN([AC_WIRESHARK_PCAP_BREAKLOOP_TRY_LINK],
[
  AC_LINK_IFELSE(
  [
      AC_LANG_SOURCE(
      [[
#	include <pcap.h>
	int main(void)
	{
	  pcap_t  *pct = NULL;
	  pcap_breakloop(pct);
	  return 0;
	}
      ]])
  ],
  [
    ws_breakloop_compiled=yes
  ],
  [
    ws_breakloop_compiled=no
  ])
])



#
# AC_WIRESHARK_PCAP_CHECK
#
AC_DEFUN([AC_WIRESHARK_PCAP_CHECK],
[
	AC_WIRESHARK_PUSH_FLAGS

	if test -z "$pcap_dir"
	then
	  # Pcap header checks
	  # XXX need to set a var AC_CHECK_HEADER(pcap.h,,)

	  #
	  # The user didn't specify a directory in which libpcap resides.
	  # First, look for a pcap-config script.
	  #
	  AC_PATH_TOOL(PCAP_CONFIG, pcap-config)

	  if test -n "$PCAP_CONFIG" ; then
	    #
	    # Found it.
	    #
	    # Now check whether it's the libpcap 1.0 version, which
	    # put a space after "-L" - on some platforms, that doesn't
	    # work.
	    #
	    AC_MSG_CHECKING(for broken pcap-config)
	    case "`\"$PCAP_CONFIG\" --libs`" in

	    "-L "*)
	      #
	      # Space after -L.  Pretend pcap-config doesn't exist.
	      #
	      AC_MSG_RESULT(yes)
	      PCAP_CONFIG=""
	      ;;

	    *)
	      #
	      # No space after -L.
	      #
	      AC_MSG_RESULT(no)
	      ;;
	    esac
	  fi
	  if test -n "$PCAP_CONFIG" ; then
	    #
	    # Found it, and it's usable; use it to get the include flags
	    # for libpcap.
	    #
	    CPPFLAGS="$CPPFLAGS `\"$PCAP_CONFIG\" --cflags`"
	  else
	    #
	    # Didn't find it; we have to look for libpcap ourselves.
	    # We assume that the current library search path will work,
	    # but we may have to look for the header in a "pcap"
	    # subdirectory of "/usr/include" or "/usr/local/include",
	    # as some systems apparently put "pcap.h" in a "pcap"
	    # subdirectory, and we also check "$prefix/include" - and
	    # "$prefix/include/pcap", in case $prefix is set to
	    # "/usr/include" or "/usr/local/include".
	    #
	    # XXX - should we just add "$prefix/include" to the include
	    # search path and "$prefix/lib" to the library search path?
	    #
	    AC_MSG_CHECKING(for extraneous pcap header directories)
	    found_pcap_dir=""
	    pcap_dir_list="/usr/local/include/pcap /usr/include/pcap $prefix/include/pcap $prefix/include"
	    for pcap_dir in $pcap_dir_list
	    do
	      if test -d $pcap_dir ; then
		if test x$pcap_dir != x/usr/include -a x$pcap_dir != x/usr/local/include ; then
		    CPPFLAGS="$CPPFLAGS -I$pcap_dir"
		fi
		found_pcap_dir=" $found_pcap_dir -I$pcap_dir"
		break
	      fi
	    done

	    if test "$found_pcap_dir" != "" ; then
	      AC_MSG_RESULT(found --$found_pcap_dir added to CFLAGS)
	    else
	      AC_MSG_RESULT(not found)
	    fi
	  fi
	else
	  #
	  # The user specified a directory in which libpcap resides,
	  # so add the "include" subdirectory of that directory to
	  # the include file search path and the "lib" subdirectory
	  # of that directory to the library search path.
	  #
	  # XXX - if there's also a libpcap in a directory that's
	  # already in CPPFLAGS or LDFLAGS, this won't make us find
	  # the version in the specified directory, as the compiler
	  # and/or linker will search that other directory before it
	  # searches the specified directory.
	  #
	  CPPFLAGS="$CPPFLAGS -I$pcap_dir/include"
	  AC_WIRESHARK_ADD_DASH_L(LDFLAGS, $pcap_dir/lib)
	fi

	# Pcap header check
	AC_CHECK_HEADER(pcap.h,,
	    AC_MSG_ERROR([[Header file pcap.h not found; if you installed libpcap
from source, did you also do \"make install-incl\", and if you installed a
binary package of libpcap, is there also a developer's package of libpcap,
and did you also install that package?]]))

	if test -n "$PCAP_CONFIG" ; then
	  #
	  # We have pcap-config; we assume that means we have libpcap
	  # installed and that pcap-config will tell us whatever
	  # libraries libpcap needs.
	  #
	  if test x$enable_static = xyes; then
	    PCAP_LIBS="`\"$PCAP_CONFIG\" --libs --static`"
	  else
	    PCAP_LIBS="`\"$PCAP_CONFIG\" --libs`"
	  fi
	  AC_DEFINE(HAVE_LIBPCAP, 1, [Define to use libpcap library])
	else
	  #
	  # Check to see if we find "pcap_open_live" in "-lpcap".
	  # Also check for various additional libraries that libpcap might
	  # require.
	  #
	  AC_CHECK_LIB(pcap, pcap_open_live,
	    [
	      PCAP_LIBS=-lpcap
	      AC_DEFINE(HAVE_LIBPCAP, 1, [Define to use libpcap library])
	    ], [
	      ac_wireshark_extras_found=no
	      ac_save_LIBS="$LIBS"
	      for extras in "-lcfg -lodm" "-lpfring"
	      do
		AC_MSG_CHECKING([for pcap_open_live in -lpcap with $extras])
		LIBS="-lpcap $extras $ac_save_LIBS"
		#
		# XXX - can't we use AC_CHECK_LIB here?
		#
		AC_TRY_LINK(
		    [
#	include <pcap.h>
		    ],
		    [
	pcap_open_live(NULL, 0, 0, 0, NULL);
		    ],
		    [
			ac_wireshark_extras_found=yes
			AC_MSG_RESULT([yes])
			PCAP_LIBS="-lpcap $extras"
			AC_DEFINE(HAVE_LIBPCAP, 1, [Define to use libpcap library])
		    ],
		    [
			AC_MSG_RESULT([no])
		    ])
		if test x$ac_wireshark_extras_found = xyes
		then
		    break
		fi
	      done
	      if test x$ac_wireshark_extras_found = xno
	      then
		AC_MSG_ERROR([Can't link with library libpcap.])
	      fi
	      LIBS=$ac_save_LIBS
	    ])
	fi
	AC_SUBST(PCAP_LIBS)

	#
	# Check whether various variables and functions are defined by
	# libpcap.
	#
	ac_save_LIBS="$LIBS"
	LIBS="$PCAP_LIBS $LIBS"
	AC_CHECK_FUNCS(pcap_open_dead pcap_freecode)
	#
	# pcap_breakloop may be present in the library but not declared
	# in the pcap.h header file.  If it's not declared in the header
	# file, attempts to use it will get warnings, and, if we're
	# building with warnings treated as errors, that warning will
	# cause compilation to fail.
	#
	# We are therefore first testing whether the function is present
	# and then, if we're compiling with warnings as errors, testing
	# whether it is usable.  It is usable if it compiles without
	# a -Wimplicit warning (the "compile with warnings as errors"
	# option requires GCC). If it is not usable, we fail and tell
	# the user that the pcap.h header needs to be updated.
	#
	# Ceteris paribus, this should only happen with Mac OS X 10.3[.x] which
	# can have an up-to-date pcap library without the corresponding pcap
	# header.
	#
	# However, it might also happen on some others OSes with some erroneous
	# system manipulations where multiple versions of libpcap might co-exist
	# e.g. hand made symbolic link from libpcap.so -> libpcap.so.0.8 but
	# having the pcap header version 0.7.
	#
	AC_MSG_CHECKING([whether pcap_breakloop is present])
	ac_CFLAGS_saved="$CFLAGS"
	AC_WIRESHARK_PCAP_BREAKLOOP_TRY_LINK
	if test "x$ws_breakloop_compiled" = "xyes"; then
	  AC_MSG_RESULT(yes)
	  AC_DEFINE(HAVE_PCAP_BREAKLOOP, 1, [Define if pcap_breakloop is known])
	  if test "x$with_warnings_as_errors" = "xyes"; then
	    AC_MSG_CHECKING([whether pcap_breakloop is usable])
	    CFLAGS="$CFLAGS -Werror -Wimplicit"
	    AC_WIRESHARK_PCAP_BREAKLOOP_TRY_LINK
	    if test "x$ws_breakloop_compiled" = "xyes"; then
	      AC_MSG_RESULT(yes)
	    else
	      AC_MSG_RESULT(no)
	      AC_MSG_ERROR(
[Your pcap library is more recent than your pcap header.
As you are building with compiler warnings treated as errors, Wireshark
won't be able to use functions not declared in that header.
If you wish to build with compiler warnings treated as errors, You should
install a newer version of the header file.])
	    fi
	    CFLAGS="$ac_CFLAGS_saved"
	  fi
	else
	  AC_MSG_RESULT(no)
	fi

	#
	# Later versions of Mac OS X 10.3[.x] ship a pcap.h that
	# doesn't define pcap_if_t but ship an 0.8[.x] libpcap,
	# so the library has "pcap_findalldevs()", but pcap.h
	# doesn't define "pcap_if_t" so you can't actually *use*
	# "pcap_findalldevs()".
	#
	# That even appears to be true of systems shipped with
	# 10.3.4, so it doesn't appear only to be a case of
	# Software Update not updating header files.
	#
	# (You can work around this by installing the 0.8 header
	# files.)
	#
	AC_CACHE_CHECK([whether pcap_findalldevs is present and usable],
	  [ac_cv_func_pcap_findalldevs],
	  [
	    AC_LINK_IFELSE(
	      [
		AC_LANG_SOURCE(
		  [[
		    #include <pcap.h>
		    main()
		    {
		      pcap_if_t *devpointer;
		      char errbuf[1];

		      pcap_findalldevs(&devpointer, errbuf);
		    }
		  ]])
	      ],
	      [
		ac_cv_func_pcap_findalldevs=yes
	      ],
	      [
		ac_cv_func_pcap_findalldevs=no
	      ])
	  ])
	#
	# Don't check for other new routines that showed up after
	# "pcap_findalldevs()" if we don't have a usable
	# "pcap_findalldevs()", so we don't end up using them if the
	# "pcap.h" is crufty and old and doesn't declare them.
	#
	if test $ac_cv_func_pcap_findalldevs = "yes" ; then
	  AC_DEFINE(HAVE_PCAP_FINDALLDEVS, 1,
	   [Define to 1 if you have the `pcap_findalldevs' function and a pcap.h that declares pcap_if_t.])
	  AC_CHECK_FUNCS(pcap_datalink_val_to_name pcap_datalink_name_to_val)
	  AC_CHECK_FUNCS(pcap_datalink_val_to_description)
	  AC_CHECK_FUNCS(pcap_list_datalinks pcap_set_datalink pcap_lib_version)
	  AC_CHECK_FUNCS(pcap_get_selectable_fd pcap_free_datalinks)
	  AC_CHECK_FUNC(pcap_create,
	  [
	    AC_DEFINE(HAVE_PCAP_CREATE, 1,
	     [Define to 1 if you have the `pcap_create' function.])
	    AC_DEFINE(CAN_SET_CAPTURE_BUFFER_SIZE, 1,
	     [Define to 1 if the capture buffer size can be set.])
	  ])
	  AC_CHECK_FUNCS(bpf_image pcap_set_tstamp_precision)
	fi

	AC_WIRESHARK_POP_FLAGS
	LIBS="$ac_save_LIBS"
])

AC_DEFUN([AC_WIRESHARK_PCAP_REMOTE_CHECK],
[
    ac_save_LIBS="$LIBS"
    LIBS="$PCAP_LIBS $LIBS"
    AC_DEFINE(HAVE_REMOTE, 1, [Define to 1 to enable remote
              capturing feature in WinPcap library])
    AC_CHECK_FUNCS(pcap_open)
    if test $ac_cv_func_pcap_open = "yes" ; then
        AC_DEFINE(HAVE_PCAP_REMOTE, 1,
            [Define to 1 if you have WinPcap remote capturing support and prefer to use these new API features.])
    fi
    AC_CHECK_FUNCS(pcap_setsampling)
    LIBS="$ac_save_LIBS"
])

#
# AC_WIRESHARK_ZLIB_CHECK
#
AC_DEFUN([AC_WIRESHARK_ZLIB_CHECK],
[
	AC_WIRESHARK_PUSH_FLAGS

	if test "x$zlib_dir" != "x"
	then
	  #
	  # The user specified a directory in which zlib resides,
	  # so add the "include" subdirectory of that directory to
	  # the include file search path and the "lib" subdirectory
	  # of that directory to the library search path.
	  #
	  # XXX - if there's also a zlib in a directory that's
	  # already in CPPFLAGS or LDFLAGS, this won't make us find
	  # the version in the specified directory, as the compiler
	  # and/or linker will search that other directory before it
	  # searches the specified directory.
	  #
	  CPPFLAGS="$CPPFLAGS -I$zlib_dir/include"
	  AC_WIRESHARK_ADD_DASH_L(LDFLAGS, $zlib_dir/lib)
	fi

	#
	# Make sure we have "zlib.h".  If we don't, it means we probably
	# don't have zlib, so don't use it.
	#
	AC_CHECK_HEADER(zlib.h,,
	  [
	    if test "x$zlib_dir" != "x"
	    then
	      #
	      # The user used "--with-zlib=" to specify a directory
	      # containing zlib, but we didn't find the header file
	      # there; that either means they didn't specify the
	      # right directory or are confused about whether zlib
	      # is, in fact, installed.  Report the error and give up.
	      #
	      AC_MSG_ERROR([zlib header not found in directory specified in --with-zlib])
	    else
	      if test "x$want_zlib" = "xyes"
	      then
		#
		# The user tried to force us to use the library, but we
		# couldn't find the header file; report an error.
		#
		AC_MSG_ERROR(Header file zlib.h not found.)
	      else
		#
		# We couldn't find the header file; don't use the
		# library, as it's probably not present.
		#
		want_zlib=no
	      fi
	    fi
	  ])

	if test "x$want_zlib" != "xno"
	then
		#
		# Well, we at least have the zlib header file.
		# We link with zlib to support uncompression of
		# gzipped network traffic, e.g. in an HTTP request
		# or response body.
		#
		if test "x$zlib_dir" != "x"
		then
		  WS_CPPFLAGS="$WS_CPPFLAGS -I$zlib_dir/include"
		  AC_WIRESHARK_ADD_DASH_L(WS_LDFLAGS, $zlib_dir/lib)
		fi
		LIBS="-lz $LIBS"
		AC_DEFINE(HAVE_ZLIB, 1, [Define to use zlib library])
		#
		# Check for "inflatePrime()" in zlib, which we need
		# in order to read compressed capture files.
		#
		AC_CHECK_FUNCS(inflatePrime)

		if test "x$ac_cv_func_inflatePrime" = "xyes" ; then
			#
			# Now check for "inflatePrime()" in zlib when
			# linking with the linker flags for GTK+
			# applications; people often grab XFree86 source
			# and build and install it on their systems,
			# and they appear sometimes to misconfigure
			# XFree86 so that, even on systems with zlib,
			# it assumes there is no zlib, so the XFree86
			# build process builds and installs its
			# own zlib in the X11 library directory.
			#
			# The zlib in at least some versions of XFree86
			# is an older version that may lack "inflatePrime()",
			# and that's the zlib with which Wireshark gets
			# linked, so the build of Wireshark fails.
			#
			AC_MSG_CHECKING([for inflatePrime missing when linking with X11])
			AC_TRY_LINK_FUNC(inflatePrime, AC_MSG_RESULT(no),
			  [
			    AC_MSG_RESULT(yes)
			    AC_MSG_ERROR(old zlib found when linking with X11 - get rid of old zlib.)
			  ])
		fi
	fi

	AC_WIRESHARK_POP_FLAGS
])

#
# AC_WIRESHARK_LIBLUA_CHECK
#
# Sets $have_lua to yes or no.
# If it's yes, it also sets $LUA_CFLAGS and $LUA_LIBS.
AC_DEFUN([AC_WIRESHARK_LIBLUA_CHECK],[

	AC_WIRESHARK_PUSH_FLAGS

	if test "x$want_lua_dir" = "x"
	then
		# The user didn't tell us where to find Lua.  Let's go look for it.

		# First, try the standard (pkg-config) way.
		# Unfortunately Lua's pkg-config file isn't standardly named.
		# Some distributions allow installation of multiple versions of
		# Lua at the same time.  On such systems each version has its
		# own package name.
		#
		# We use a for loop instead of giving all the package names to
		# PKG_CHECK_MODULES because doing the latter doesn't appear to
		# work reliably (some package names are not searched for).
		for pkg in "lua < 5.3" lua5.2 lua-5.2 lua52 lua5.1 lua-5.1 lua51 lua5.0 lua-5.0 lua50
		do
			AC_MSG_CHECKING(if you have $pkg)
			PKG_CHECK_EXISTS($pkg,
			[
			 AC_MSG_RESULT(yes)
			 have_lua=yes
			],
			[
			 AC_MSG_RESULT(no)
			])

			if test "x$have_lua" = "xyes"
			then
				PKG_WIRESHARK_CHECK_SYSTEM_MODULES(LUA, $pkg)
				CPPFLAGS="$LUA_CFLAGS $CPPFLAGS"
				AC_CHECK_HEADERS(lua.h lualib.h lauxlib.h)
				break
			fi
		done
	fi

	if test "x$have_lua" != "xyes"
	then
		# We don't have pkg-config or the user specified the path to
		# Lua (in $want_lua_dir).
		# Let's look for the header file.

		AC_MSG_CHECKING(for the location of lua.h)
		if test "x$want_lua_dir" = "x"
		then
			# The user didn't tell us where to look so we'll look in some
			# standard locations.
			want_lua_dir="/usr/local /usr $prefix"
		fi
		for dir in $want_lua_dir
		do
			if test -r "$dir/include/lua.h"
			then
				header_dir="$dir/include"
				lua_dir=$dir
				break
			fi

			for ver in 5.2 52 5.1 51 5.0 50
			do
				if test -r "$dir/include/lua$ver/lua.h"
				then
					header_dir="$dir/include/lua$ver"
					lua_dir=$dir
					break
				fi
			done
		done

		if test "x$header_dir" = "x"
		then
			have_lua=no
			AC_MSG_RESULT(not found)
		else
			AC_MSG_RESULT($header_dir)

			AC_MSG_CHECKING(the Lua version)
			lua_ver=`$AWK AS_ESCAPE('/LUA_VERSION_NUM/ { print $NF; }' $header_dir/lua.h | sed 's/0/./')`

			if test "x$lua_ver" = "x5.3"
			then
				# Wireshark doesn't compile with Lua 5.3 today
				AC_MSG_RESULT($lua_ver - disabling Lua support)
				have_lua=no
			else
				AC_MSG_RESULT($lua_ver)

				CPPFLAGS="$CPPFLAGS -I$header_dir"
				AC_CHECK_HEADERS(lua.h lualib.h lauxlib.h, ,
				[
					have_lua=no
				])
			fi

			if test "x$have_lua" = "x"
			then
				# Set LUA_CFLAGS
				LUA_CFLAGS="-I$header_dir"

				# We have the header files and they work.  Now let's check if we
				# have the library and it works.
				#
				# XXX - if there's also a liblua in a directory that's
				# already in CPPFLAGS or LDFLAGS, this won't make us find
				# the version in the specified directory, as the compiler
				# and/or linker will search that other directory before it
				# searches the specified directory.
				#
				# XXX - lib64?
				LDFLAGS="-L$lua_dir/lib $LDFLAGS"
				AC_SEARCH_LIBS(luaL_openlibs, [lua-${lua_ver} lua${lua_ver} lua],
				[
					LUA_LIBS="-L$lua_dir/lib $ac_cv_search_luaL_openlibs -lm"
					have_lua=yes
				],[
					have_lua=no
				], -lm)
			fi
		fi
	fi

	AC_WIRESHARK_POP_FLAGS
])

#
# AC_WIRESHARK_LIBPORTAUDIO_CHECK
#
AC_DEFUN([AC_WIRESHARK_LIBPORTAUDIO_CHECK],[

	AC_WIRESHARK_PUSH_FLAGS
	wireshark_save_LIBS="$LIBS"

	if test "x$portaudio_dir" != "x"
	then
		#
		# The user specified a directory in which libportaudio
		# resides, so add the "include" subdirectory of that directory to
		# the include file search path and the "lib" subdirectory
		# of that directory to the library search path.
		#
		# XXX - if there's also a libportaudio in a directory that's
		# already in CPPFLAGS or LDFLAGS, this won't make us find
		# the version in the specified directory, as the compiler
		# and/or linker will search that other directory before it
		# searches the specified directory.
		#
		CPPFLAGS="$CPPFLAGS -I$portaudio_dir/include"
		LDFLAGS="$LDFLAGS -L$portaudio_dir/lib"
	fi
	LIBS="-lportaudio $LIBS"

	#
	# Make sure we have "portaudio.h".  If we don't, it means we probably
	# don't have libportaudio, so don't use it.
	#
	AC_CHECK_HEADERS(portaudio.h,,
	[
		if test "x$portaudio_dir" != "x"
		then
			#
			# The user used "--with-portaudio=" to specify a directory
			# containing libportaudio, but we didn't find the header file
			# there; that either means they didn't specify the
			# right directory or are confused about whether libportaudio
			# is, in fact, installed.  Report the error and give up.
			#
			AC_MSG_ERROR([libportaudio header not found in directory specified in --with-portaudio])
		else
			if test "x$want_portaudio" = "xyes"
			then
				#
				# The user tried to force us to use the library, but we
				# couldn't find the header file; report an error.
				#
				AC_MSG_ERROR(Header file portaudio.h not found.)
			else
				#
				# We couldn't find the header file; don't use the
				# library, as it's probably not present.
				#
				want_portaudio=no
			fi
		fi
	])

	#
	# Check whether we have the right version of portaudio
	#
	if test "x$want_portaudio" != "xno"
	then
		AC_CHECK_TYPE(PortAudioStream,
		AC_DEFINE(PORTAUDIO_API_1, 1, [Define if we are using version of of the Portaudio library API]),
		,
		[#include <portaudio.h>])
	fi

	if test "x$want_portaudio" != "xno"
	then
		#
		# Well, we at least have the portaudio header file.
		#
		# let's check if the libs are there
		#
		PORTAUDIO_LIBS=""
		PORTAUDIO_INCLUDES=""

		AC_CHECK_LIB(portaudio, Pa_Initialize,
		[
			if test "x$portaudio_dir" != "x"
			then
				#
				# Put the "-I" and "-L" flags for portaudio
				# into PORTAUDIO_INCLUDES and PORTAUDIO_LIBS,
				# respectively.
				#
				PORTAUDIO_LIBS="-L$portaudio_dir/lib -lportaudio"
				PORTAUDIO_INCLUDES="-I$portaudio_dir/include"
			else
				PORTAUDIO_LIBS="-lportaudio"
			fi
			AC_DEFINE(HAVE_LIBPORTAUDIO, 1, [Define to use libportaudio library])
			want_portaudio=yes
		],[
			# User requested --with-portaudio but it isn't available
			if test "x$want_portaudio" = "xyes"
			then
				AC_MSG_ERROR(Linking with libportaudio failed.)
			fi
			want_portaudio=no
		])
		AC_SUBST(PORTAUDIO_LIBS)
		AC_SUBST(PORTAUDIO_INCLUDES)

	fi

	LIBS="$wireshark_save_LIBS"
	AC_WIRESHARK_POP_FLAGS
])


#
# AC_WIRESHARK_C_ARES_CHECK
#
AC_DEFUN([AC_WIRESHARK_C_ARES_CHECK],
[
	want_c_ares=defaultyes

	if test "x$want_c_ares" = "xdefaultyes"; then
		want_c_ares=yes
	fi

	if test "x$want_c_ares" = "xyes"; then
		AC_CHECK_LIB(cares, ares_init,
		  [
		    C_ARES_LIBS=-lcares
		    AC_DEFINE(HAVE_C_ARES, 1, [Define to use c-ares library])
		    have_good_c_ares=yes
		  ])
	else
		AC_MSG_RESULT(not required)
	fi
])


#
# AC_WIRESHARK_LIBCAP_CHECK
#
AC_DEFUN([AC_WIRESHARK_LIBCAP_CHECK],
[
	want_libcap=defaultyes

	if test "x$want_libcap" = "xdefaultyes"; then
		want_libcap=yes
	fi

	if test "x$want_libcap" = "xyes"; then
		AC_CHECK_LIB(cap, cap_set_flag,
		  [
		    LIBCAP_LIBS=-lcap
		    AC_DEFINE(HAVE_LIBCAP, 1, [Define to use the libcap library])
		    have_good_libcap=yes
		  ],,
		)
	else
		AC_MSG_RESULT(not required)
	fi
])


#
# AC_WIRESHARK_KRB5_CHECK
#
AC_DEFUN([AC_WIRESHARK_KRB5_CHECK],
[
	AC_WIRESHARK_PUSH_FLAGS
	wireshark_save_LIBS="$LIBS"

	if test "x$krb5_dir" != "x"
	then
	  #
	  # The user specified a directory in which kerberos resides,
	  # so add the "include" subdirectory of that directory to
	  # the include file search path and the "lib" subdirectory
	  # of that directory to the library search path.
	  #
	  # XXX - if there's also a kerberos in a directory that's
	  # already in CPPFLAGS or LDFLAGS, this won't make us find
	  # the version in the specified directory, as the compiler
	  # and/or linker will search that other directory before it
	  # searches the specified directory.
	  #
	  KRB5_CFLAGS="-I$krb5_dir/include"
	  ac_heimdal_version=`grep heimdal $krb5_dir/include/krb5.h | head -n 1 | sed 's/^.*heimdal.*$/HEIMDAL/'`
	  # MIT Kerberos moved krb5.h to krb5/krb5.h starting with release 1.5
	  ac_mit_version_olddir=`grep 'Massachusetts' $krb5_dir/include/krb5.h | head -n 1 | sed 's/^.*Massachusetts.*$/MIT/'`
	  ac_mit_version_newdir=`grep 'Massachusetts' $krb5_dir/include/krb5/krb5.h | head -n 1 | sed 's/^.*Massachusetts.*$/MIT/'`
	  ac_krb5_version="$ac_heimdal_version$ac_mit_version_olddir$ac_mit_version_newdir"
	  if test "x$ac_krb5_version" = "xHEIMDAL"
	  then
	      KRB5_LIBS="-L$krb5_dir/lib -lkrb5 -lasn1 $SSL_LIBS -lroken -lcrypt"
	  else
	      KRB5_LIBS="-L$krb5_dir/lib -lkrb5 -lk5crypto -lcom_err"
	  fi
	  if test "x$ac_krb5_version" = "xMIT"
	  then
	    AC_DEFINE(HAVE_MIT_KERBEROS, 1, [Define to use MIT kerberos])
	  fi
	else
	  AC_PATH_TOOL(KRB5_CONFIG, krb5-config)
	  if test -x "$KRB5_CONFIG"
	  then
	    KRB5_CFLAGS=`"$KRB5_CONFIG" --cflags`
	    KRB5_LIBS=`"$KRB5_CONFIG" --libs`
	    #
	    # If -lcrypto is in KRB5_FLAGS, we require it to build
	    # with Heimdal/MIT.  We don't want to built with it by
	    # default, due to annoying license incompatibilities
	    # between the OpenSSL license and the GPL, so:
	    #
	    #	if SSL_LIBS is set to a non-empty string, we
	    #	remove -lcrypto from KRB5_LIBS and replace
	    #	it with SSL_LIBS;
	    #
	    #	if SSL_LIBS is not set to a non-empty string
	    #	we fail with an appropriate error message.
	    #
	    case "$KRB5_LIBS" in
	    *-lcrypto*)
		if test ! -z "$SSL_LIBS"
		then
		    KRB5_LIBS=`echo $KRB5_LIBS | sed 's/-lcrypto//'`
		    KRB5_LIBS="$KRB5_LIBS $SSL_LIBS"
		else
		    AC_MSG_ERROR([Kerberos library requires -lcrypto, so you must specify --with-ssl])
		fi
		;;
	    esac
	    ac_krb5_version=`"$KRB5_CONFIG" --version | head -n 1 | sed -e 's/^.*heimdal.*$/HEIMDAL/' -e 's/^Kerberos .*$/MIT/' -e 's/^Solaris Kerberos .*$/MIT/'`
 	  fi
	fi

	CPPFLAGS="$CPPFLAGS $KRB5_CFLAGS"

	#
	# Make sure we have "krb5.h".  If we don't, it means we probably
	# don't have kerberos, so don't use it.
	#
	AC_CHECK_HEADER(krb5.h,,
	  [
	    if test "x$krb5_dir" != "x"
	    then
	      #
	      # The user used "--with-krb5=" to specify a directory
	      # containing kerberos, but we didn't find the header file
	      # there; that either means they didn't specify the
	      # right directory or are confused about whether kerberos
	      # is, in fact, installed.  Report the error and give up.
	      #
	      AC_MSG_ERROR([kerberos header not found in directory specified in --with-krb5])
	    else
	      if test "x$want_krb5" = "xyes"
	      then
		#
		# The user tried to force us to use the library, but we
		# couldn't find the header file; report an error.
		#
		AC_MSG_ERROR(Header file krb5.h not found.)
	      else
		#
		# We couldn't find the header file; don't use the
		# library, as it's probably not present.
		#
		KRB5_CFLAGS=""
		KRB5_LIBS=""
		want_krb5=no
		AC_MSG_RESULT(No Heimdal or MIT header found - disabling dissection for some kerberos data in packet decoding)
	      fi
	    fi
	  ])

	if test "x$want_krb5" != "xno"
	then
	    #
	    # Well, we at least have the krb5 header file.
	    # Check whether this is Heimdal or MIT.
	    #
	    AC_MSG_CHECKING(whether the Kerberos library is Heimdal or MIT)
	    if test "x$ac_krb5_version" = "xHEIMDAL" -o "x$ac_krb5_version" = "xMIT"
	    then
		#
		# Yes.
		# Check whether we have krb5_kt_resolve - and whether
		# we need to link with -lresolv when linking with
		# the Kerberos library.
		#
		AC_MSG_RESULT($ac_krb5_version)
		found_krb5_kt_resolve=no
		for extras in "" "-lresolv"
		do
		    LIBS="$KRB5_LIBS $extras $wireshark_save_LIBS"
		    if test -z "$extras"
		    then
			AC_MSG_CHECKING([whether $ac_krb5_version includes krb5_kt_resolve])
		    else
			AC_MSG_CHECKING([whether $ac_krb5_version includes krb5_kt_resolve (linking with $extras)])
		    fi
		    AC_TRY_LINK(
			[
			],
			[
			    krb5_kt_resolve();
			],
			[
			    #
			    # We found "krb5_kt_resolve()".
			    #
			    AC_MSG_RESULT(yes)
			    if test -n "$extras"; then
			      KRB5_LIBS="$KRB5_LIBS $extras"
			    fi
			    AC_DEFINE(HAVE_KERBEROS, 1, [Define to use kerberos])
	    		    if test "x$ac_krb5_version" = "xHEIMDAL"
			    then
				AC_DEFINE(HAVE_HEIMDAL_KERBEROS, 1, [Define to use heimdal kerberos])
			    elif test "x$ac_krb5_version" = "xMIT"
			    then
				AC_DEFINE(HAVE_MIT_KERBEROS, 1, [Define to use MIT kerberos])
			    fi
			    found_krb5_kt_resolve=yes
			    break
			],
			[
			    AC_MSG_RESULT(no)
			])
		done
		if test "$found_krb5_kt_resolve" = no
		then
		    #
		    # We didn't find "krb5_kt_resolve()" in the
		    # Kerberos library, even when we tried linking
		    # with -lresolv; we can't link with kerberos.
		    #
		    if test "x$want_krb5" = "xyes"
		    then
			#
			# The user tried to force us to use the library,
			# but we can't do so; report an error.
			#
			AC_MSG_ERROR(Usable $ac_krb5_version not found)
		    else
			#
			# Don't use
			#
			AC_MSG_RESULT(Usable $ac_krb5_version not found - disabling dissection for some kerberos data in packet decoding)
			KRB5_CFLAGS=""
			KRB5_LIBS=""
			want_krb5=no
		    fi
		else
		    #
		    # We can link with Kerberos; see whether krb5.h
		    # defines KEYTYPE_ARCFOUR_56 (where "defines" means
		    # "as a #define or as an enum member).
		    #
		    AC_MSG_CHECKING([whether krb5.h defines KEYTYPE_ARCFOUR_56])
		    AC_COMPILE_IFELSE(
		      [
			AC_LANG_SOURCE(
			  [[
			    #include <krb5.h>
			    #include <stdio.h>

			    main()
			    {
			      printf("%u\n", KEYTYPE_ARCFOUR_56);
			    }
			  ]])
		      ],
		      [
			AC_MSG_RESULT(yes)
			AC_DEFINE(HAVE_KEYTYPE_ARCFOUR_56, 1, [Define if krb5.h defines KEYTYPE_ARCFOUR_56])
		      ],
		      [
			AC_MSG_RESULT(no)
		      ])
		fi
	    else
		#
		# It's not Heimdal or MIT.
		#
		AC_MSG_RESULT(no)
		if test "x$want_krb5" = "xyes"
		then
		    #
		    # The user tried to force us to use the library,
		    # but we can't do so; report an error.
		    #
		    AC_MSG_ERROR(Kerberos not found)
		else
		    #
		    # Don't use.
		    #
		    AC_MSG_RESULT(Kerberos not found - disabling dissection for some kerberos data in packet decoding)
		    KRB5_CFLAGS=""
		    KRB5_LIBS=""
		    want_krb5=no
		fi
	    fi
	else
	    #
	    # The user asked us not to use Kerberos, or they didn't
	    # say whether they wanted us to use it but we found
	    # that we couldn't.
	    #
	    KRB5_CFLAGS=""
	    KRB5_LIBS=""
	    want_krb5=no
	fi
	AC_SUBST(KRB5_CFLAGS)
	AC_SUBST(KRB5_LIBS)

	LIBS="$wireshark_save_LIBS"
	AC_WIRESHARK_POP_FLAGS
])

#
# AC_WIRESHARK_GEOIP_CHECK
#
AC_DEFUN([AC_WIRESHARK_GEOIP_CHECK],
[
	want_geoip=defaultyes

	if test "x$want_geoip" = "xdefaultyes"; then
		want_geoip=yes
	fi

	if test "x$want_geoip" = "xyes"; then
		AC_CHECK_LIB(GeoIP, GeoIP_new,
		  [
		    GEOIP_LIBS=-lGeoIP
	    	AC_DEFINE(HAVE_GEOIP, 1, [Define to use GeoIP library])
		have_good_geoip=yes
		  ],,
		)
		if test "x$have_good_geoip" = "xyes"; then
			AC_CHECK_LIB(GeoIP, GeoIP_country_name_by_ipnum_v6,
			  [
				AC_DEFINE(HAVE_GEOIP_V6, 1, [Define if GeoIP supports IPv6 (GeoIP 1.4.5 and later)])
			  ],,
			)
		fi
	else
		AC_MSG_RESULT(not required)
	fi
])

#
# AC_WIRESHARK_LIBSSH_CHECK
#
AC_DEFUN([AC_WIRESHARK_LIBSSH_CHECK],
[
	want_libssh=defaultyes

	if test "x$want_libssh" = "xdefaultyes"; then
		want_libssh=yes
	fi

	if test "x$want_libssh" = "xyes"; then
		AC_CHECK_LIB(ssh, ssh_new,
		  [
		    LIBSSH_LIBS=-lssh
			AC_DEFINE(HAVE_LIBSSH, 1, [Define to use libssh library])
			have_good_libssh=yes
		  ],,
		)
		AC_MSG_CHECKING([whether libssh >= 0.6.0 for sshdump, ciscodump])
		PKG_CHECK_EXISTS([libssh >= 0.6.0],
		  [
		   AC_MSG_RESULT(yes)
		   AC_DEFINE(HAVE_LIBSSH_POINTSIX, 1, [Defined if libssh >= 0.6.0])
		   have_libssh_pointsix=yes
		  ],
		  [AC_MSG_RESULT(no)]
		)
		if test "x$have_libssh_pointsix" = "xyes"; then
			# ssh_userauth_agent exists only >= 0.6.0, but not on Windows
			# so check explicitly
			AC_CHECK_LIB(ssh, ssh_userauth_agent,
			  [
			    AC_DEFINE(HAVE_SSH_USERAUTH_AGENT, 1, [Libssh library has ssh_userauth_agent])
			    have_ssh_userauth_agent=yes
			  ],,
			)
		fi
	else
		AC_MSG_RESULT(not required)
	fi
])

#AC_WIRESHARK_LDFLAGS_CHECK
#
# $1 : ldflag(s) to test
#
# We attempt to compile and link a test program with the specified linker
# flag. The defined flag is added to LDFLAGS only if the link succeeds.
#
AC_DEFUN([AC_WIRESHARK_LDFLAGS_CHECK],
[LD_OPTION="$1"
AC_MSG_CHECKING(whether we can add $LD_OPTION to LDFLAGS)
AC_WIRESHARK_PUSH_FLAGS
LDFLAGS="$LDFLAGS $LD_OPTION"
can_add_to_ldflags=""
AC_LINK_IFELSE(
  [
    AC_LANG_SOURCE([[main() { return; }]])
  ],
  [
    AC_MSG_RESULT(yes)
    AX_APPEND_FLAG([$LD_OPTION], [WS_LDFLAGS])
    can_add_to_ldflags=yes
  ],
  [
    AC_MSG_RESULT(no)
    can_add_to_ldflags=no
  ])
  AC_WIRESHARK_POP_FLAGS
])

dnl
dnl Check whether, if you pass an unknown warning option to the
dnl compiler, it fails or just prints a warning message and succeeds.
dnl Set ac_wireshark_unknown_warning_option_error to the appropriate flag
dnl to force an error if it would otherwise just print a warning message
dnl and succeed.
dnl
AC_DEFUN([AC_WIRESHARK_CHECK_UNKNOWN_WARNING_OPTION_ERROR],
    [
	AC_MSG_CHECKING([whether the compiler fails when given an unknown warning option])
	AC_WIRESHARK_PUSH_FLAGS
	CFLAGS="$CFLAGS -Wxyzzy-this-will-never-succeed-xyzzy"
	AC_TRY_COMPILE(
	    [],
	    [return 0],
	    [
		AC_MSG_RESULT([no, adding -Werror=unknown-warning-option])
		#
		# We're assuming this is clang, where
		# -Werror=unknown-warning-option is the appropriate
		# option to force the compiler to fail.
		#
		ac_wireshark_unknown_warning_option_error="-Werror=unknown-warning-option"
	    ],
	    [
		AC_MSG_RESULT([yes])
	    ])
	AC_WIRESHARK_POP_FLAGS
    ])

dnl
dnl Check whether, if you pass a valid-for-C-but-not-C++ option to the
dnl compiler, it fails or just prints a warning message and succeeds.
dnl Set ac_wireshark_non_cxx_warning_option_error to the appropriate flag
dnl to force an error if it would otherwise just print a warning message
dnl and succeed.
dnl
AC_DEFUN([AC_WIRESHARK_CHECK_NON_CXX_WARNING_OPTION_ERROR],
    [
	AC_MSG_CHECKING([whether the compiler fails when given an warning option not supported for C++])
	#
	# Some C+ compilers warn about -Wmissing-prototypes, and some warn
	# about -Wmissing-declarations.  Check both.
	#
	AC_LANG_PUSH(C++)
	AC_WIRESHARK_PUSH_FLAGS
	save_CXXFLAGS="$CXXFLAGS"
	for flag in -Wmissing-prototypes -Wmissing-declarations; do
	    CXXFLAGS="$save_CXXFLAGS $flag"
	    AC_TRY_COMPILE(
		[],
		[return 0],
		[
		    #
		    # We're assuming this is g++, where -Werror is the
		    # appropriate option to force the compiler to fail.
		    # Check whether it fails with -Werror.
		    #
		    # NOTE: it's important to put -Werror *before*
		    # the flag, otherwise, when it sees the flag,
		    # it doesn't yet know that warnings should be
		    # treated as errors, and doesn't treat the
		    # "that's C-only" warning as an error.
		    #
		    CXXFLAGS="$save_CXXFLAGS -Werror $flag"
		    AC_TRY_COMPILE(
			[],
			[return 0],
			[
			    #
			    # No, so this option is actually OK
			    # with our C++ compiler.
			    #
			    # (We need an empty command here to
			    # prevent some versions of autoconf
			    # from generating a script with an
			    # empty "then" clause for an if statement.)
			    #
			    :
			],
			[
			    #
			    # Yes, so we need -Werror for the tests.
			    #
			    ac_wireshark_non_cxx_warning_option_error="-Werror"
			    break
			])
		])
	done
	AC_WIRESHARK_POP_FLAGS
	AC_LANG_POP
	if test x$ac_wireshark_non_cxx_warning_option_error = x; then
	    AC_MSG_RESULT([yes])
	else
	    AC_MSG_RESULT([no, adding -Werror])
	fi
    ])

#
# AC_WIRESHARK_COMPILER_FLAGS_CHECK
#
# $1 : flags to test
# $2 : if supplied, C for C-only flags, CXX for C++-only flags
# $3 : if supplied, a program to try to compile with the flag
#      and, if the compile fails when -Werror is turned on,
#      we don't add the flag - used for warning flags that
#      issue incorrect or non-useful warnings with some
#      compiler versions
# $4 : must be supplied if $3 is supplied - a message describing
#      for what the test program is testing
#
# The macro first determines if the compiler supports GCC-style flags.
# Then it attempts to compile with the defined cflags.  The defined
# flags are added to WS_CHECKED_CFLAGS only if the compilation succeeds.
# CFLAGS remains unchanged. can_add_to_cflags is set to "no" when the
# flag is checked but unavailable. (Like-wise for CXXFLAGS.)
#
# We do this because not all such options are necessarily supported by
# the version of the particular compiler we're using.
#
AC_DEFUN([AC_WIRESHARK_COMPILER_FLAGS_CHECK],
[GCC_OPTION="$1"
can_add_to_cflags=""
can_add_to_cxxflags=""
if test "x$ac_supports_gcc_flags" = "xyes" ; then
  if test "$2" != CXX ; then
    #
    # Not C++-only; if this can be added to the C compiler flags, add them.
    #
    # If the option begins with "-W", add
    # $ac_wireshark_unknown_warning_option_error to make sure that
    # we'll get an error if it's an unknown warning option; not all
    # compilers treat unknown warning options as errors (I'm looking at
    # you, clang).
    #
    # If the option begins with "-f" or "-m", add -Werror to make sure
    # that we'll get an error if we get "argument unused during compilation"
    # warnings, as those will either cause a failure for files compiled
    # with -Werror or annoying noise for files compiled without it.
    # (Yeah, you, clang.)
    #
    AC_MSG_CHECKING(whether we can add $GCC_OPTION to CFLAGS)
    AC_WIRESHARK_PUSH_FLAGS
    if expr "x$GCC_OPTION" : "x-W.*" >/dev/null
    then
      CFLAGS="$CFLAGS $ac_wireshark_unknown_warning_option_error $GCC_OPTION"
    elif expr "x$GCC_OPTION" : "x-f.*" >/dev/null
    then
      CFLAGS="$CFLAGS -Werror $GCC_OPTION"
    elif expr "x$GCC_OPTION" : "x-m.*" >/dev/null
    then
      CFLAGS="$CFLAGS -Werror $GCC_OPTION"
    else
      CFLAGS="$CFLAGS $GCC_OPTION"
    fi
    AC_COMPILE_IFELSE(
      [
        AC_LANG_SOURCE([[int foo;]])
      ],
      [
        AC_MSG_RESULT(yes)
        can_add_to_cflags=yes
        #
        # OK, do we have a test program?  If so, check
        # whether it fails with this option and -Werror,
        # and, if so, don't include it.
        #
        # We test arg 4 here because arg 3 is a program which
        # could contain quotes (breaking the comparison).
        #
        if test "x$4" != "x" ; then
          CFLAGS="$CFLAGS -Werror"
          AC_MSG_CHECKING(whether $GCC_OPTION $4)
          AC_COMPILE_IFELSE(
            [AC_LANG_SOURCE($3)],
            [
              AC_MSG_RESULT(no)
              #
              # Remove "force an error for a warning" options, if we
              # added them, by setting CFLAGS to the saved value plus
              # just the new option.
              #
              AX_APPEND_FLAG([$GCC_OPTION], [WS_CFLAGS])
              if test "$CC" = "$CC_FOR_BUILD"; then
                #
                # We're building the build tools with the same compiler
                # with which we're building Wireshark, so add the flags
                # to the flags for that compiler as well.
                #
                AX_APPEND_FLAG([$GCC_OPTION], [WS_CFLAGS_FOR_BUILD])
              fi
            ],
            [
              AC_MSG_RESULT(yes)
            ])
        else
          #
          # Remove "force an error for a warning" options, if we
          # added them, by setting CFLAGS to the saved value plus
          # just the new option.
          #
          AX_APPEND_FLAG([$GCC_OPTION], [WS_CFLAGS])
          if test "$CC" = "$CC_FOR_BUILD"; then
            #
            # We're building the build tools with the same compiler
            # with which we're building Wireshark, so add the flags
            # to the flags for that compiler as well.
            #
            AX_APPEND_FLAG([$GCC_OPTION], [WS_CFLAGS_FOR_BUILD])
          fi
        fi
      ],
      [
        AC_MSG_RESULT(no)
        can_add_to_cflags=no
      ])
      AC_WIRESHARK_POP_FLAGS
  fi
  #
  # Did we find a C++ compiler?
  #
  if test "x$CXX" != "x" ; then
    #
    # Yes.  Is this option only for the C compiler?
    #
    if test "$2" != C ; then
      #
      # Not C-only; if this option can be added to the C++ compiler
      # options, add it.
      #
      # If the option begins with "-W", add
      # $ac_wireshark_unknown_warning_option_error, as per the above, and
      # also add $ac_wireshark_non_cxx_warning_option_error, because at
      # lease some versions of g++ whine about -Wmissing-prototypes, the
      # fact that at least one of those versions refuses to warn about
      # function declarations without an earlier declaration nonwithstanding;
      # perhaps there's a reason not to warn about that with C++ even though
      # warning about it can be a Good Idea with C, but it's not obvious to
      # me).
      #
      # If the option begins with "-f" or "-m", add -Werror to make sure
      # that we'll get an error if we get "argument unused during compilation"
      # warnings, as those will either cause a failure for files compiled
      # with -Werror or annoying noise for files compiled without it.
      # (Yeah, you, clang++.)
      #
      AC_MSG_CHECKING(whether we can add $GCC_OPTION to CXXFLAGS)
      AC_WIRESHARK_PUSH_FLAGS
      if expr "x$GCC_OPTION" : "x-W.*" >/dev/null
      then
        CXXFLAGS="$CXXFLAGS $ac_wireshark_unknown_warning_option_error $ac_wireshark_non_cxx_warning_option_error $GCC_OPTION"
      elif expr "x$GCC_OPTION" : "x-f.*" >/dev/null
      then
        CXXFLAGS="$CXXFLAGS -Werror $GCC_OPTION"
      elif expr "x$GCC_OPTION" : "x-m.*" >/dev/null
      then
        CXXFLAGS="$CXXFLAGS -Werror $GCC_OPTION"
      else
        CXXFLAGS="$CXXFLAGS $GCC_OPTION"
      fi
      AC_LANG_PUSH([C++])
      AC_COMPILE_IFELSE(
        [
          AC_LANG_SOURCE([[int foo;]])
        ],
        [
          AC_MSG_RESULT(yes)
          can_add_to_cxxflags=yes
          #
          # OK, do we have a test program?  If so, check
          # whether it fails with this option and -Werror,
          # and, if so, don't include it.
          #
          # We test arg 4 here because arg 3 is a program which
          # could contain quotes (breaking the comparison).
          #
          if test "x$4" != "x" ; then
            CXXFLAGS="$CXXFLAGS -Werror"
            AC_MSG_CHECKING(whether $GCC_OPTION $4)
            AC_COMPILE_IFELSE(
              [AC_LANG_SOURCE($3)],
              [
                AC_MSG_RESULT(no)
                #
                # Remove "force an error for a warning" options, if we
                # added them, by setting CXXFLAGS to the saved value plus
                # just the new option.
                #
                AX_APPEND_FLAG([$GCC_OPTION], [WS_CXXFLAGS])
              ],
              [
                AC_MSG_RESULT(yes)
              ])
          else
            #
            # Remove "force an error for a warning" options, if we
            # added them, by setting CXXFLAGS to the saved value plus
            # just the new option.
            #
            AX_APPEND_FLAG([$GCC_OPTION], [WS_CXXFLAGS])
          fi
        ],
        [
          AC_MSG_RESULT(no)
          can_add_to_cxxflags=no
        ])
      AC_WIRESHARK_POP_FLAGS
      AC_LANG_POP([C++])
    fi
    if test "(" "$can_add_to_cflags" = "yes" -a "$can_add_to_cxxflags" = "no" ")" \
         -o "(" "$can_add_to_cflags" = "no" -a "$can_add_to_cxxflags" = "yes" ")"
    then
      #
      # Confusingly, some C++ compilers like -Wmissing-prototypes but
      # don't like -Wmissing-declarations and others like
      # -Wmissing-declarations but don't like -Wmissing-prototypes,
      # the fact that the corresponding C compiler likes both.  Don't
      # warn about them.
      #
      if test "(" x$GCC_OPTION != x-Wmissing-prototypes ")" \
           -a "(" x$GCC_OPTION != x-Wmissing-declarations ")"
      then
         AC_MSG_WARN([$CC and $CXX appear to be a mismatched pair])
      fi
    fi
  fi
fi
])

# AC_WIRESHARK_GCC_FORTIFY_SOURCE_CHECK
#
# Checks if '-D_FORTIFY_SOURCE=...' is OK to use in CPPFLAGS.
#  Use '-D_FORTIFY_SOURCE=...' in CPPFLAGS only if the GCC 'optimization level' is > 0.
#  The use of '-D_FORTIFY_SOURCE=...' will cause a warning with at least some versions
#    of glibc if the  GCC "optimization level" is 0 (default or -O or -O0)
#    when using GCC to compile a source file which references the macro definition.
#
# See: http://gcc.gnu.org/ml/gcc-patches/2004-09/msg02055.html
# See: http://sourceware.org/bugzilla/show_bug.cgi?id=13979
#
#   We'll use '-D_FORTIFY_SOURCE=2' only if there's no warning; Among other things this means
#    that the  use of '-D_FORTIFY_SOURCE=2' with '-Werror' and '-O0' won't cause
#    the compiler to stop on error.
#   Assumption: CFLAGS already contains whatever optimization option including none) is
#    to be used.
#

AC_DEFUN([AC_WIRESHARK_GCC_FORTIFY_SOURCE_CHECK],
[
if test "x$GCC" = "xyes" -o "x$CC" = "xclang" ; then
  AC_MSG_CHECKING([whether -D_FORTIFY_SOURCE=2 can be used (without generating a warning)])
  AC_WIRESHARK_PUSH_FLAGS
  CFLAGS="$CFLAGS -Werror"
  CPPFLAGS="$CPPFLAGS -D_FORTIFY_SOURCE=2"
  AC_COMPILE_IFELSE([
    AC_LANG_SOURCE([[
                  #include <stdio.h>
                      int foo;
                  ]])],
                  [
                    AC_MSG_RESULT(yes)
                    AX_APPEND_FLAG([-D_FORTIFY_SOURCE=2], [WS_CPPFLAGS])
                  ],
                  [
                    AC_MSG_RESULT(no)
                  ])
  AC_WIRESHARK_POP_FLAGS
fi
])

#
# AC_WIRESHARK_GCC_SYSTEM_INCLUDE
#
# Replace -I include flag for -isystem in FLAGS argument
#
AC_DEFUN([AC_WIRESHARK_GCC_SYSTEM_INCLUDE],
[
	if test "x$GCC" = "xyes" -o "x$CC" = "xclang" ; then
		$1=`printf %s " $$1" \
			| sed -e 's/  *-I *\// -isystem\//g' -e 's/^ *//'`
	fi
])

#
# PKG_WIRESHARK_CHECK_SYSTEM_MODULES
#
AC_DEFUN([PKG_WIRESHARK_CHECK_SYSTEM_MODULES],
[
	PKG_CHECK_MODULES($@)
	AC_WIRESHARK_GCC_SYSTEM_INCLUDE($1_CFLAGS)
])

# Based on AM_PATH_GTK in gtk-2.0.m4.

dnl AC_WIRESHARK_QT_MODULE_CHECK_WITH_QT_VERSION([MODULE, MINIMUM-VERSION,
dnl     REQUESTED-MAJOR_VERSION, [ACTION-IF-FOUND, [ACTION-IF-NOT-FOUND]]])
dnl Test for a particular Qt module, for a particular Qt major version,
dnl and, if we find it add the flags and libraries for it to Qt_CFLAGS
dnl and Qt_LIBS.
dnl
AC_DEFUN([AC_WIRESHARK_QT_MODULE_CHECK_WITH_QT_VERSION],
[
	case "$3" in

	4)
		#
		# Check for Qt 4.
		#
		modprefix="Qt"
		#
		# Version of the module we're checking for.
		# Default to 4.0.0.
		#
		min_qt_version=ifelse([$2], ,4.0.0,$2)
		;;

	5)
		#
		# Check for Qt 5.
		#
		modprefix="Qt5"
		#
		# Version of the module we're checking for.
		# Default to 5.0.0.
		#
		min_qt_version=5.0.0
		;;

	*)
		AC_MSG_ERROR([Qt version $3 is not a known Qt version])
		;;
	esac

	pkg_config_module="${modprefix}$1"
	AC_MSG_CHECKING(for $pkg_config_module - version >= $min_qt_version)
	if $PKG_CONFIG --atleast-version $min_qt_version $pkg_config_module; then
		mod_version=`$PKG_CONFIG --modversion $pkg_config_module`
		AC_MSG_RESULT(yes (version $mod_version))
		mod_cflags=`$PKG_CONFIG --cflags $pkg_config_module`
		AC_WIRESHARK_GCC_SYSTEM_INCLUDE(mod_cflags)
		Qt_CFLAGS="$Qt_CFLAGS $mod_cflags"
		Qt_LIBS="$Qt_LIBS `$PKG_CONFIG --libs $pkg_config_module`"
		# Run Action-If-Found
		ifelse([$4], , :, [$4])
	else
		AC_MSG_RESULT(no)
		# Run Action-If-Not-Found
		ifelse([$5], , :, [$5])
	fi
])

dnl AC_WIRESHARK_QT_MODULE_CHECK([MODULE, MINIMUM-VERSION,
dnl     REQUESTED-MAJOR_VERSION, [ACTION-IF-FOUND, [ACTION-IF-NOT-FOUND]]])
dnl Test for a particular Qt module and add the flags and libraries
dnl for it to Qt_CFLAGS and Qt_LIBS.
dnl
AC_DEFUN([AC_WIRESHARK_QT_MODULE_CHECK],
[
	#
	# Prior to Qt 5, modules were named QtXXX.
	# In Qt 5, they're named Qt5XXX.
	# This will need to change to handle future major Qt releases.
	#
	case "$3" in

	yes|unspecified)
		#
		# Check for all versions of Qt we support.
		# Try the Qt 5 version first.
		#
		versions="5 4"
		;;

	4)
		#
		# Check for Qt 4.
		#
		versions="4"
		;;

	5)
		#
		# Check for Qt 5.
		#
		versions="5"
		;;

	*)
		AC_MSG_ERROR([Qt version $3 is not a known Qt version])
		;;
	esac

	for version in $versions
	do
		AC_WIRESHARK_QT_MODULE_CHECK_WITH_QT_VERSION($1, $2,
		    $version, [foundit=yes], [foundit=no])
		if test "x$foundit" = "xyes"; then
                        break
		fi
	done

	if test "x$foundit" = "xyes"; then
		# Remember which version of Qt we found
		qt_version=$version
		# Run Action-If-Found
		ifelse([$4], , :, [$4])
	else
		# Run Action-If-Not-Found
		ifelse([$5], , :, [$5])
	fi
])

AC_DEFUN([AC_WIRESHARK_QT_ADD_PIC_IF_NEEDED],
[
    AC_LANG_PUSH([C++])
	AC_WIRESHARK_PUSH_FLAGS
	CPPFLAGS="$CPPFLAGS $Qt_CFLAGS"
	AC_MSG_CHECKING([whether Qt works without -fPIC])
	AC_PREPROC_IFELSE(
		[AC_LANG_SOURCE([[#include <QtCore>]])],
		[AC_MSG_RESULT(yes)],
		[
			AC_MSG_RESULT(no)
			AC_MSG_CHECKING([whether Qt works with -fPIC])
			CPPFLAGS="$CPPFLAGS -fPIC"
			AC_PREPROC_IFELSE(
				[AC_LANG_SOURCE([[#include <QtCore>]])],
				[
					AC_MSG_RESULT(yes)
					Qt_CFLAGS="$Qt_CFLAGS -fPIC"
				],
				[
					AC_MSG_RESULT(no)
					AC_MSG_ERROR(Couldn't compile Qt without -fPIC nor with -fPIC)
				])
		])
	AC_WIRESHARK_POP_FLAGS
    AC_LANG_POP([C++])
])

dnl AC_WIRESHARK_QT_CHECK([MINIMUM-VERSION, REQUESTED-MAJOR_VERSION,
dnl     [ACTION-IF-FOUND, [ACTION-IF-NOT-FOUND]]])
dnl Test for Qt and define Qt_CFLAGS and Qt_LIBS.
dnl
AC_DEFUN([AC_WIRESHARK_QT_CHECK],
[
	qt_version_to_check="$2"

	#
	# Check for the Core module; if we don't have that,
	# we don't have Qt.  If we *do* have it, we know what
	# version it is, so only check for that version of
	# other modules.
	#
	AC_WIRESHARK_QT_MODULE_CHECK(Core, $1, $qt_version_to_check,
	    [
	      qt_version_to_check=$qt_version
	      QT_VERSION=$mod_version
	      QT_VERSION_MAJOR=`echo "$QT_VERSION" | cut -f1 -d.`
	      QT_VERSION_MINOR=`echo "$QT_VERSION" | cut -f2 -d.`
	      QT_VERSION_MICRO=`echo "$QT_VERSION" | cut -f3 -d.`

	      # Qt 5.7 and later requires C++11
	      AS_IF([test $QT_VERSION_MAJOR -eq 5 -a $QT_VERSION_MINOR -ge 7],
		[AS_IF([test "$HAVE_CXX11" -eq 0], [AC_MSG_ERROR([Qt 5.7 and later requires C++11])])])

	    ],
	    [no_qt=yes])

	if test x"$no_qt" = x ; then
		#
		# We need the Gui module as well.
		#
		AC_WIRESHARK_QT_MODULE_CHECK(Gui, $1, $qt_version_to_check, ,
		    [no_qt=yes])
	fi

	if test x"$no_qt" = x ; then
		#
		# Qt 5.0 appears to move the widgets out of Qt GUI
		# to Qt Widgets; look for the Widgets module, but
		# don't fail if we don't have it.
		#
		AC_WIRESHARK_QT_MODULE_CHECK(Widgets, $1, $qt_version_to_check)

		#
		# Qt 5.0 also appears to move the printing support into
		# the Qt PrintSupport module.
		#
		AC_WIRESHARK_QT_MODULE_CHECK(PrintSupport, $1, $qt_version_to_check)

		#
		# Qt 5.0 added multimedia in the Qt
		# Multimedia module.
		#
		have_qt_multimedia_lib=no
		AC_WIRESHARK_QT_MODULE_CHECK(Multimedia, $1, $qt_version_to_check,
			have_qt_multimedia_lib=yes
			AC_DEFINE(QT_MULTIMEDIA_LIB, 1, [Define if we have QtMultimedia]))

		#
		# While we're at it, look for QtMacExtras.  (Presumably
		# if we're not building for OS X, it won't be present.)
		#
		# XXX - is there anything in QtX11Extras or QtWinExtras
		# that we should be using?
		#
		AC_WIRESHARK_QT_MODULE_CHECK(MacExtras, $1, $qt_version_to_check,
			AC_DEFINE(QT_MACEXTRAS_LIB, 1, [Define if we have QtMacExtras]))

		AC_WIRESHARK_QT_ADD_PIC_IF_NEEDED

		# Run Action-If-Found
		ifelse([$3], , :, [$3])
	else
		# Run Action-If-Not-Found
		ifelse([$4], , :, [$4])
	fi

])

dnl AC_WIRESHARK_QT_TOOL_CHECK([TOOLPATHVAR, TOOL, REQUESTED-MAJOR_VERSION])
dnl Test for a particular Qt tool for some specific version of Qt
dnl
AC_DEFUN([AC_WIRESHARK_QT_TOOL_CHECK],
[
	#
	# At least in some versions of Debian/Ubuntu, and perhaps
	# other OSes, the Qt build tools are just links to a
	# program called "qtchooser", and even if you want to
	# build with Qt 5, running the tool might give you the
	# Qt 4 version of the tool unless you run the tool with
	# a -qt=5 argument.
	#
	# So we look for qtchooser and, if we find it, use the
	# -qt={version} argument, otherwise we look for particular
	# tool versions using tool name suffixes.
	#
	AC_PATH_PROG(QTCHOOSER, qtchooser)
	if test ! -z "$QTCHOOSER"; then
		#
		# We found qtchooser; we assume that means that
		# the tool is linked to qtchooser, so that we
		# can run it with the -qt={version} flag to get
		# the appropriate version of the tool.
		#
		AC_PATH_PROG($1, $2)
		if test "x$$1" = x; then
			#
			# We can't build Qt Wireshark without that
			# tool..
			#
			AC_MSG_ERROR(I couldn't find $2; make sure it's installed and in your path)
		fi

		#
		# Add the -qt={version} argument to it.
		#
		$1="$$1 -qt=$qt_version"
	else
		#
		# Annoyingly, on some Linux distros (e.g. Debian)
		# the Qt 5 tools have no suffix and the Qt 4 tools
		# have suffix -qt4. On other distros (e.g. openSUSE)
		# the Qt 5 tools have suffix -qt5 and the Qt 4 tools
		# have no suffix.
		#
		# So we check for the tool first with the -qtN suffix
		# and then with no suffix.
		#
		AC_PATH_PROGS($1, [$2-qt$qt_version $2])
		if test "x$$1" = x; then
			#
			# We can't build Qt Wireshark without that
			# tool..
			#
			AC_MSG_ERROR(I couldn't find $2-qt$qt_version or $2; make sure it's installed and in your path)
		fi
	fi
])

AC_DEFUN([AC_WIRESHARK_QT_TOOL_CHECK_LRELEASE],
[
  AC_WIRESHARK_QT_TOOL_CHECK(LRELEASE, lrelease, $2)
  AC_MSG_CHECKING(whether lrelease -version works)
  lrelease_version=`$LRELEASE -version 2>&AS_MESSAGE_LOG_FD`
  AS_IF([test $? -ne 0],
    [
      AC_MSG_RESULT(no)
      AC_MSG_ERROR([$LRELEASE -version returned non-zero exit status])
    ])
  AC_MSG_RESULT([ok, $lrelease_version])
])