Add AC_PROG_CC_C99 to configure.ac

  We aim to compile cleanly under C99, so get autoconf to give us the
  appropriate compiler flags to enable it by default.

diff --git a/configure.ac b/configure.ac
index f2bdfd1cb28e097b8417854f58e956aa6d7a26c0..c654ab8ed13f469d0eba3221cafd961c6c2c29ed 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -4,6 +4,7 @@ AC_CONFIG_SRCDIR(onak.c)
 AC_CONFIG_HEADER(config.h)
 
 AC_PROG_CC
+AC_PROG_CC_C99
 
 AC_C_BIGENDIAN