[babl] Request a C99 compatible compiler

[Daniel Sabo <daniels src gnome org>]

commit ffb3a4d01c81961baa09d206bf87eea587e5392c
Author: Daniel Sabo <DanielSabo gmail com>
Date:   Tue Oct 8 23:17:57 2013 -0700

    Request a C99 compatible compiler

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 98dbe5d..d5e5d68 100644
--- a/configure.ac
+++ b/configure.ac
@@ -123,6 +123,7 @@ BABL_VARIADIC_MACROS
 
 # Check for programs
 AC_PROG_CC
+AC_PROG_CC_C99
 
 # Initialize libtool
 LT_PREREQ([2.2])