--- a/browser/app/Makefile.in
+++ b/browser/app/Makefile.in
@@ -67,17 +67,19 @@ DEFINES += -DAPP_UA_NAME="$(APP_UA_NAME)
 
 DIST_FILES = application.ini
 
 GRE_MILESTONE = $(shell $(PYTHON) $(topsrcdir)/config/printconfigsetting.py $(LIBXUL_DIST)/bin/platform.ini Build Milestone)
 GRE_BUILDID = $(shell $(PYTHON) $(topsrcdir)/config/printconfigsetting.py $(LIBXUL_DIST)/bin/platform.ini Build BuildID)
 
 DEFINES += -DGRE_MILESTONE=$(GRE_MILESTONE) -DGRE_BUILDID=$(GRE_BUILDID)
 
-ifndef LIBXUL_SDK
+ifdef LIBXUL_SDK
+include $(topsrcdir)/config/rules.mk
+else
 # Build a binary bootstrapping with XRE_main
 
 ifeq ($(USE_SHORT_LIBNAME), 1)
 PROGRAM = $(MOZ_APP_NAME)$(BIN_SUFFIX)
 else
 PROGRAM = $(MOZ_APP_NAME)-bin$(BIN_SUFFIX)
 endif