From 6d06bb15009e82469ef125918614cb9cb47cc09e Mon Sep 17 00:00:00 2001
From: Holger Hans Peter Freyther <zecke@selfish.org>
Date: Tue, 6 Nov 2012 23:38:57 +0100
Subject: build: Allow to set the PCAP_CFLAGS and PCAP_LIBS externally

pcap-config might not be available, e.g. on Debian6.0 and CentOS5.x. Allow
the code to be built anyway.
---
 configure.ac | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 2f4de9d..d0738f8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,10 +14,6 @@ AC_PROG_CC
 AC_PROG_INSTALL
 AC_PROG_RANLIB
 
-dnl checks for libraries
-PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 0.3.2)
-PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 0.3.0)
-
 dnl checks for header files
 AC_HEADER_STDC
 
@@ -31,11 +27,27 @@ if test x$pcapcfg = "x"; then
 	AC_MSG_ERROR([pcap-config can not be found])
 fi
 
-PCAP_LIBS=`$pcapcfg --libs`
-PCAP_CFLAGS=`$pcapcfg --cflags`
+dnl CentOS 5 and Debian 6.0 do not ship with a pcap-config and we somehow
+dnl need to support these versions. Once we drop support for these two distros
+dnl the below can be simplified again.
+AC_ARG_VAR([PCAP_LIBS], [PCAP library files])
+AC_ARG_VAR([PCAP_CFLAGS], [PCAP C compiler flags])
+
+if test "x$ac_cv_env_PCAP_LIBS_set" != "xset"; then
+	PCAP_LIBS=`$pcapcfg --libs`
+fi
+
+if test "x$ac_cv_env_PCAP_CFLAGS_set" != "xset"; then
+	PCAP_CFLAGS=`$pcapcfg --cflags`
+fi
 AC_SUBST([PCAP_LIBS])
 AC_SUBST([PCAP_CFLAGS])
 
+dnl checks for libraries
+PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 0.3.2)
+PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 0.3.0)
+
+
 # Coverage build taken from WebKit's configure.in
 AC_MSG_CHECKING([whether to enable code coverage support])
 AC_ARG_ENABLE(coverage,
-- 
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