--- grilo-plugins-0.2.16/configure.ac.orig	2015-09-23 23:58:15.000000000 +0200
+++ grilo-plugins-0.2.16/configure.ac	2015-10-20 19:10:42.545052862 +0200
@@ -46,7 +46,7 @@
 # ----------------------------------------------------------
 
 GNOME_COMPILE_WARNINGS([maximum])
-CFLAGS+=" ${WARN_CFLAGS} -Wmissing-declarations -std=c99 "
+CFLAGS="$CFLAGS ${WARN_CFLAGS} -Wmissing-declarations -std=c99 "
 
 GNOME_MAINTAINER_MODE_DEFINES