Hi, This snippet of code does what? pygtk_required_version = 2.2.0 PKG_CHECK_MODULES(GTK, [gtk+-2.0 >= gtk_required_version pygtk-2.0 >= pygtk_required_version pygtk-2.0 < 2.7.0], [], [with_pygtk=no]) It's check for pytgtk-2.0 >= 2.2.0 AND pygtk-2.0 < 2.7.0? Thanks and best regards, Carlos.