-GTK_REQUIRED_VERSION=2.12
-GLIB_REQUIRED_VERSION=2.16
-GTK_DOC_REQUIRED_VERSION=1.11
+# Recommended GTK version: at least 2.12
+# Recommended Glib version: at least 2.16
+GTK_REQUIRED_VERSION=2.6
+GLIB_REQUIRED_VERSION=2.6
+GTK_DOC_REQUIRED_VERSION=1.9