sdl_gfx: avoid using non reevaluated $(STAGING_DIR)

Signed-off-by: Lionel Landwerlin <llandwerlin@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

CHANGES

@@ -5,7 +5,7 @@
 
 	Updated/fixed packages: busybox, dbus, cloop, gdk-pixbuf,
 	hostapd, i2c-tools, libconfig, m4, openssh, openssl, qt,
-	sdl_sound, udev, usbutils, xz, zlib
+	sdl_gfx, sdl_sound, udev, usbutils, xz, zlib
 
 	New packages: dhrystone, lsuio, rsh-redone, whetstone
 

package/sdl_gfx/sdl_gfx.mk

@@ -12,9 +12,10 @@ SDL_GFX_INSTALL_TARGET:=YES
 
 SDL_GFX_DEPENDENCIES:=sdl
 
-SDL_GFX_CONF_OPT:=--with-sdl-prefix=$(STAGING_DIR)/usr \
-		--disable-sdltest \
-		--enable-static
+SDL_GFX_CONF_OPT = \
+	--with-sdl-prefix=$(STAGING_DIR)/usr \
+	--disable-sdltest \
+	--enable-static
 
 # enable mmx for newer x86's
 ifeq ($(BR2_i386)$(BR2_x86_i386)$(BR2_x86_i486)$(BR2_x86_i586)$(BR2_x86_pentiumpro)$(BR2_x86_geode),y)