(pkg-exists-p "gtk+-2.0" :atleast-version "2.4.0")
-(when (string>= (pkg-version "gtk+-2.0") "2.6.0")
+(when (pkg-exists-p "gtk+-2.0" :atleast-version "2.6.0" :error nil)
(pushnew :gtk2.6 *features*))
-(when (string>= (pkg-version "gtk+-2.0") "2.8.0")
+(when (pkg-exists-p "gtk+-2.0" :atleast-version "2.8.0" :error nil)
(pushnew :gtk2.8 *features*))
(defsystem gtk