1 files changed, 31 insertions, 0 deletions
diff --git a/autoconf/ast_c_compile_check.m4 b/autoconf/ast_c_compile_check.m4
new file mode 100644
index 000000000..0d49ec3ca
--- /dev/null
+++ b/autoconf/ast_c_compile_check.m4
@@ -0,0 +1,31 @@
+# Check if a given expression will compile using a certain header.
+
+# AST_C_COMPILE_CHECK([package], [expression], [header file], [version], [description])
+AC_DEFUN([AST_C_COMPILE_CHECK],
+[
+    if test "x${PBX_$1}" != "x1" -a "${USE_$1}" != "no"; then
+        if test "x$5" != "x"; then
+            AC_MSG_CHECKING([for $5])
+	else
+            AC_MSG_CHECKING([if "$2" compiles using $3])
+	fi
+	saved_cppflags="${CPPFLAGS}"
+	if test "x${$1_DIR}" != "x"; then
+	    $1_INCLUDE="-I${$1_DIR}/include"
+	fi
+	CPPFLAGS="${CPPFLAGS} ${$1_INCLUDE}"
+
+	AC_COMPILE_IFELSE(
+	    [ AC_LANG_PROGRAM( [#include <$3>],
+			       [ $2; ]
+			       )],
+	    [   AC_MSG_RESULT(yes)
+		PBX_$1=1
+		AC_DEFINE([HAVE_$1], 1, [Define if your system has the $1 headers.])
+		AC_DEFINE([HAVE_$1_VERSION], $4, [Define $1 headers version])
+	    ],
+	    [       AC_MSG_RESULT(no) ] 
+	)
+	CPPFLAGS="${saved_cppflags}"
+    fi
+])