diff --git a/project.conf b/project.conf
index ee7549e..02511f6 100644
--- a/project.conf
+++ b/project.conf
@@ -6,6 +6,20 @@ config=ent,h,sh
 subdirs=data,doc,include,src,tests,tools
 targets=tests
 dist=Makefile,COPYING,README.md,config.ent,config.h,config.sh
+mode=gtk3-debug
+
+#modes
+[mode::gtk2-debug]
+title=Debug (Gtk+ 2)
+
+[mode::gtk2-release]
+title=Release (Gtk+ 2)
+
+[mode::gtk3-debug]
+title=Debug (Gtk+ 3)
+
+[mode::gtk3-release]
+title=Release (Gtk+ 3)
 
 #targets
 [tests]