configure: require c99

This enables a few nice things that gcc would otherwise not allow.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

diff --git a/configure.ac b/configure.ac
index af21866..6d02770 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -25,7 +25,7 @@ AM_INIT_AUTOMAKE([1.11 foreign no-dist-gzip dist-xz])
 AM_SILENT_RULES([yes])
 
 # Check for programs
-AC_PROG_CC
+AC_PROG_CC_C99
 
 # Initialize libtool
 LT_PREREQ([2.2])