1 files changed, 33 insertions, 0 deletions
diff --git a/autoconf/ast_c_define_check.m4 b/autoconf/ast_c_define_check.m4
new file mode 100644
index 000000000..e577f0e25
--- /dev/null
+++ b/autoconf/ast_c_define_check.m4
@@ -0,0 +1,33 @@
+# Check if a given macro is defined in a certain header.
+
+# AST_C_DEFINE_CHECK([package], [macro name], [header file], [version])
+AC_DEFUN([AST_C_DEFINE_CHECK],
+[
+    if test "x${PBX_$1}" != "x1"; then
+    AC_MSG_CHECKING([for $2 in $3])
+    saved_cppflags="${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>],
+                   [#if defined($2)
+                int foo = 0;
+                    #else
+                    int foo = bar;
+                    #endif
+                0
+                   ])],
+        [   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
+    AC_SUBST(PBX_$1)
+])