diff --git a/configure.ac b/configure.ac
index 794f5947c1..c29d973b99 100644
--- a/configure.ac
+++ b/configure.ac
@@ -596,22 +596,20 @@ AC_MSG_CHECKING([for extra flags to get ANSI library prototypes])
 
 gtk_save_LIBS=$LIBS
 LIBS="$LIBS -lm"
-AC_TRY_RUN([#include <math.h>
-             int main (void) { return (log(1) != log(1.)); }],
-     AC_MSG_RESULT(none needed),
-     gtk_save_CFLAGS="$CFLAGS"
-     CFLAGS="$CFLAGS -std1"
-     AC_TRY_RUN([#include <math.h>
-	         int main (void) { return (log(1) != log(1.)); }],
-         AC_MSG_RESULT(-std1),
-         AC_MSG_RESULT()
-         CFLAGS="$gtk_save_CFLAGS"
-         AC_MSG_WARN(
-                [No ANSI prototypes found in library. (-std1 didn't work.)]),
-	 true
-     ),
-     AC_MSG_RESULT(none needed)
-)
+AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <math.h>
+                                int main (void) { return (log(1) != log(1.)); }]])],
+              [AC_MSG_RESULT(none needed)],
+              [gtk_save_CFLAGS="$CFLAGS"
+               CFLAGS="$CFLAGS -std1"
+               AC_RUN_IFELSE([AC_LANG_SOURCE([[#include <math.h>
+                                               int main (void) { return (log(1) != log(1.)); }]])],
+                             [AC_MSG_RESULT(-std1)],
+                             [AC_MSG_RESULT()
+                              CFLAGS="$gtk_save_CFLAGS"
+                              AC_MSG_WARN([No ANSI prototypes found in library. (-std1 did not work.)])],
+                             [true])],
+              [AC_MSG_RESULT(none needed)])
+
 LIBS=$gtk_save_LIBS
 
 AC_MSG_CHECKING(for the BeOS)