--- poly2tri-c-5ac75d6f09e4/configure.ac.orig	2016-01-23 15:16:45.297871668 +0100
+++ poly2tri-c-5ac75d6f09e4/configure.ac	2016-01-23 15:17:04.718530205 +0100
@@ -99,7 +99,7 @@ CFLAGS="$CFLAGS -Werror"
 # Find GLib support via pkg-config
 PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.28])
 
-CFLAGS="$CFLAGS $GLIB_CFLAGS"
+CFLAGS="$CFLAGS $GLIB_CFLAGS -std=c99"
 LDFLAGS="$LDFLAGS $GLIB_LIBS"
 LIBS="$LIBS $GLIB_LIBS"