# in the FIND_PATH() and FIND_LIBRARY() calls
INCLUDE(UsePkgConfig)
- PKGCONFIG(gtk-2.0 _GTK22IncDir _GTK22LinkDir _GTK22LinkFlags _GTK22Cflags)
+# PKGCONFIG
+FindPkgConfig(gtk-2.0 _GTK22IncDir _GTK22LinkDir _GTK22LinkFlags _GTK22Cflags)
+
+# pkg_search_module(<PREFIX> [REQUIRED] <MODULE> [<MODULE>]*)
+# checks for given modules and uses the first working one
FIND_PATH(GTK2_GTK_INCLUDE_PATH gtk/gtk.h
$ENV{GTK2_HOME}