docker: requires pkgconfig, glib2 and X11

package/docker/Config.in

@@ -1,5 +1,8 @@
 config BR2_PACKAGE_DOCKER
 	bool "docker"
+	depends on BR2_PACKAGE_XORG||BR2_PACKAGE_XORG7||BR2_PACKAGE_TINYX
+	select BR2_PACKAGE_LIBGLIB2
+	select BR2_PACKAGE_PKGCONFIG
 	help
 	  a system tray dock for X
 

package/docker/docker.mk

@@ -19,7 +19,7 @@ DOCKER_MAKE_OPT = CC=$(TARGET_CC) CXX=$(TARGET_CXX) LD=$(TARGET_LD) \
 
 DOCKER_INSTALL_TARGET_OPT = PREFIX=$(TARGET_DIR)/usr install
 
-DOCKER_DEPENDENCIES = uclibc
+DOCKER_DEPENDENCIES = uclibc pkgconfig libglib2 $(XSERVER)
 
 $(eval $(call AUTOTARGETS,package,docker))