directfb: fixup directfb-config for correctness

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/directfb/directfb.mk

@@ -137,6 +137,14 @@ HOST_DIRECTFB_BUILD_CMDS = \
 HOST_DIRECTFB_INSTALL_CMDS = \
 	$(INSTALL) -m 0755 $(@D)/tools/directfb-csource $(HOST_DIR)/usr/bin
 
+define DIRECTFB_STAGING_CONFIG_FIXUP
+	$(SED) "s,^prefix=.*,prefix=\'$(STAGING_DIR)/usr\',g" \
+		-e "s,^exec_prefix=.*,exec_prefix=\'$(STAGING_DIR)/usr\',g" \
+		$(STAGING_DIR)/usr/bin/directfb-config
+endef
+
+DIRECTFB_POST_INSTALL_STAGING_HOOKS += DIRECTFB_STAGING_CONFIG_FIXUP
+
 $(eval $(call AUTOTARGETS,package,directfb))
 $(eval $(call AUTOTARGETS,package,directfb,host))