transmission: add gtk support

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/transmission/Config.in

@@ -33,6 +33,13 @@ config BR2_PACKAGE_TRANSMISSION_REMOTE
 	bool "transmission-remote"
 	help
 	  Install transmission remote management tool.
+
+config BR2_PACKAGE_TRANSMISSION_GTK
+	bool "transmission-gtk"
+	depends on BR2_PACKAGE_LIBGTK2
+	help
+	  Install transmission GTK-based GUI interface.
+
 endif
 
 comment "Transmission requires a toolchain with IPv6 support"

package/transmission/transmission.mk

@@ -14,7 +14,6 @@ TRANSMISSION_DEPENDENCIES = \
 	zlib
 
 TRANSMISSION_CONF_OPT = \
-	--disable-gtk \
 	--disable-libnotify \
 	--enable-lightweight
 
@@ -49,4 +48,11 @@ else
 	TRANSMISSION_CONF_OPT += --disable-remote
 endif
 
+ifeq ($(BR2_PACKAGE_TRANSMISSION_GTK),y)
+	TRANSMISSION_CONF_OPT += --enable-gtk
+	TRANSMISSION_DEPENDENCIES += libgtk2
+else
+	TRANSMISSION_CONF_OPT += --disable-gtk
+endif
+
 $(eval $(call AUTOTARGETS))