--- colord-1.2.0/configure.ac.orig	2014-04-13 08:14:11.677141206 +0200
+++ colord-1.2.0/configure.ac	2014-04-13 08:15:38.100472738 +0200
@@ -171,7 +171,7 @@
 if test x$enable_udev != xno; then
 	PKG_CHECK_MODULES(UDEV, libudev)
 	PKG_CHECK_MODULES(GUDEV, gudev-1.0)
-	COLORD_REQUIRES_PRIVATE+=", libudev"
+	COLORD_REQUIRES_PRIVATE="${COLORD_REQUIRES_PRIVATE}, libudev"
 	AC_DEFINE(HAVE_UDEV,1,[Use UDEV support])
 fi
 AM_CONDITIONAL(HAVE_UDEV, test x$enable_udev = xyes)