diff --git a/CleanSpec.mk b/CleanSpec.mk
index 74ad978..6d81733 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -125,6 +125,8 @@
 # Now we switched to build against Mac OS X SDK 10.6
 $(call add-clean-step, rm -rf $(OUT_DIR)/host/darwin-x86/obj)
 
+$(call add-clean-step, rm -f $(OUT_DIR)/versions_checked.mk)
+
 # ************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
 # ************************************************
diff --git a/core/Makefile b/core/Makefile
index 1a2ca46..fb92027 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1298,7 +1298,7 @@
 
 # -----------------------------------------------------------------
 # The emulator package
-
+ifeq ($(BUILD_EMULATOR),true)
 INTERNAL_EMULATOR_PACKAGE_FILES += \
         $(HOST_OUT_EXECUTABLES)/emulator$(HOST_EXECUTABLE_SUFFIX) \
         prebuilts/qemu-kernel/$(TARGET_ARCH)/kernel-qemu \
@@ -1314,6 +1314,7 @@
 	@echo "Package: $@"
 	$(hide) zip -qj $@ $(INTERNAL_EMULATOR_PACKAGE_FILES)
 
+endif
 # -----------------------------------------------------------------
 # Old PDK stuffs, retired
 # The pdk package (Platform Development Kit)
diff --git a/core/main.mk b/core/main.mk
index d0b277c..6516fa6 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -187,7 +187,9 @@
 ifeq ($(strip $(wildcard $(MACOSX_SDK))),)
   BUILD_EMULATOR := false
 endif
-endif
+else   # HOST_OS is not darwin
+  BUILD_EMULATOR := true
+endif  # HOST_OS is darwin
 
 $(shell echo 'VERSIONS_CHECKED := $(VERSION_CHECK_SEQUENCE_NUMBER)' \
         > $(OUT_DIR)/versions_checked.mk)