diff -r 83dc7e55f715 -r 01745e531a0a make/windows/makefiles/sa.make
--- a/make/windows/makefiles/sa.make	Mon Apr 04 10:59:22 2016 -0700
+++ b/make/windows/makefiles/sa.make	Thu Apr 14 11:08:30 2016 -0700
@@ -44,9 +44,11 @@
 HS_ALT_SRC_REL=src/closed
 HS_ALT_SRC = $(WorkSpace)/$(HS_ALT_SRC_REL)
 !ifndef HS_ALT_MAKE
+!if exist($(WorkSpace)/make/closed)
 HS_ALT_MAKE=$(WorkSpace)/make/closed
 !endif
 !endif
+!endif
 
 HS_COMMON_SRC = $(WorkSpace)/$(HS_COMMON_SRC_REL)