1 files changed, 90 insertions, 0 deletions
diff --git a/autoconf/ast_ext_lib.m4 b/autoconf/ast_ext_lib.m4
new file mode 100644
index 000000000..57d83a5d1
--- /dev/null
+++ b/autoconf/ast_ext_lib.m4
@@ -0,0 +1,90 @@
+# Helper function to setup variables for a package.
+# $1 -> the package name. Used in configure.ac and also as a prefix
+#	for the variables ($1_DIR, $1_INCLUDE, $1_LIB) in makeopts
+# $3 ->	option name, used in --with-$3 or --without-$3 when calling configure.
+# $2 and $4 are just text describing the package (short and long form)
+
+# AST_EXT_LIB_SETUP([package], [short description], [configure option name], [long description])
+
+AC_DEFUN([AST_EXT_LIB_SETUP],
+[
+    $1_DESCRIP="$2"
+    $1_OPTION="$3"
+    AC_ARG_WITH([$3], AC_HELP_STRING([--with-$3=PATH],[use $2 files in PATH $4]),
+    [
+	case ${withval} in
+	n|no)
+	USE_$1=no
+	;;
+	y|ye|yes)
+	ac_mandatory_list="${ac_mandatory_list} $1"
+	;;
+	*)
+	$1_DIR="${withval}"
+	ac_mandatory_list="${ac_mandatory_list} $1"
+	;;
+	esac
+    ])
+    PBX_$1=0
+    AC_SUBST([$1_LIB])
+    AC_SUBST([$1_INCLUDE])
+    AC_SUBST([$1_DIR])
+    AC_SUBST([PBX_$1])
+])
+
+# Check for existence of a given package ($1), either looking up a function
+# in a library, or, if no function is supplied, only check for the
+# existence of the header files.
+
+# AST_EXT_LIB_CHECK([package], [library], [function], [header],
+#	 [extra libs], [extra cflags], [version])
+AC_DEFUN([AST_EXT_LIB_CHECK],
+[
+if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
+   pbxlibdir=""
+   # if --with-$1=DIR has been specified, use it.
+   if test "x${$1_DIR}" != "x"; then
+      if test -d ${$1_DIR}/lib; then
+      	 pbxlibdir="-L${$1_DIR}/lib"
+      else
+      	 pbxlibdir="-L${$1_DIR}"
+      fi
+   fi
+   pbxfuncname="$3"
+   if test "x${pbxfuncname}" = "x" ; then   # empty lib, assume only headers
+      AST_$1_FOUND=yes
+   else
+      AC_CHECK_LIB([$2], [${pbxfuncname}], [AST_$1_FOUND=yes], [AST_$1_FOUND=no], ${pbxlibdir} $5)
+   fi
+
+   # now check for the header.
+   if test "${AST_$1_FOUND}" = "yes"; then
+      $1_LIB="${pbxlibdir} -l$2 $5"
+      # if --with-$1=DIR has been specified, use it.
+      if test "x${$1_DIR}" != "x"; then
+	 $1_INCLUDE="-I${$1_DIR}/include"
+      fi
+      $1_INCLUDE="${$1_INCLUDE} $6"
+      if test "x$4" = "x" ; then	# no header, assume found
+         $1_HEADER_FOUND="1"
+      else				# check for the header
+         saved_cppflags="${CPPFLAGS}"
+         CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"
+	 AC_CHECK_HEADER([$4], [$1_HEADER_FOUND=1], [$1_HEADER_FOUND=0])
+         CPPFLAGS="${saved_cppflags}"
+      fi
+      if test "x${$1_HEADER_FOUND}" = "x0" ; then
+         $1_LIB=""
+         $1_INCLUDE=""
+      else
+         if test "x${pbxfuncname}" = "x" ; then		# only checking headers -> no library
+	    $1_LIB=""
+	 fi
+         PBX_$1=1
+         # XXX don't know how to evaluate the description (third argument) in AC_DEFINE_UNQUOTED
+         AC_DEFINE_UNQUOTED([HAVE_$1], 1, [Define this to indicate the ${$1_DESCRIP} library])
+	 AC_DEFINE_UNQUOTED([HAVE_$1_VERSION], [$7], [Define to indicate the ${$1_DESCRIP} library version])
+      fi
+   fi
+fi
+])