diff -Naur unity-greeter-12.10.2/configure unity-greeter-12.10.2.new/configure
--- unity-greeter-12.10.2/configure	2012-08-30 18:21:17.000000000 +0200
+++ unity-greeter-12.10.2.new/configure	2012-09-02 14:14:01.695534478 +0200
@@ -3638,7 +3638,7 @@
 fi
 
 
-for ac_prog in valac-0.16 valac
+for ac_prog in valac-0.18 valac
 do
   # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
diff -Naur unity-greeter-12.10.2/configure.ac unity-greeter-12.10.2.new/configure.ac
--- unity-greeter-12.10.2/configure.ac	2012-08-30 18:20:37.000000000 +0200
+++ unity-greeter-12.10.2.new/configure.ac	2012-09-02 14:14:01.695534478 +0200
@@ -6,7 +6,7 @@
 AC_CONFIG_MACRO_DIR(m4)
 AM_INIT_AUTOMAKE
 AM_PROG_CC_C_O
-UG_PROG_VALAC([valac-0.16 valac], [0.15.1])
+UG_PROG_VALAC([valac-0.18 valac], [0.15.1])
 AM_CONFIG_HEADER(config.h)
 AM_MAINTAINER_MODE
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES(yes)])