Attempt to fix a parallel make issue (code here depends on included sdk/bindings/xpcom
		but can run before the sdk is copied to out/linux)

https://bugs.gentoo.org/973421
https://bugs.gentoo.org/950489
https://bugs.gentoo.org/675646

--- a/src/VBox/HostServices/SharedFolders/Makefile.kmk
+++ b/src/VBox/HostServices/SharedFolders/Makefile.kmk
@@ -67,5 +67,7 @@
 VBoxSharedFolders_LIBS = \
 	$(LIB_RUNTIME)
 
+VBoxSharedFolders_DEPS = $(VBOX_PATH_SDK)/bindings/xpcom/include/xpcom/xpcom-config.h
+
 include $(FILE_KBUILD_SUB_FOOTER)