patch 7.4.772
Problem:    Racket 6.2 is not supported on MS-Windows.
Solution:   Check for the "racket" subdirectory. (Weiyong Mao)
diff --git a/src/Make_mvc.mak b/src/Make_mvc.mak
index a6534c8..722127d 100644
--- a/src/Make_mvc.mak
+++ b/src/Make_mvc.mak
@@ -797,7 +797,8 @@
 !endif
 CFLAGS = $(CFLAGS) -DFEAT_MZSCHEME -I $(MZSCHEME)\include
 !if EXIST("$(MZSCHEME)\collects\scheme\base.ss") \
-	|| EXIST("$(MZSCHEME)\collects\scheme\base.rkt") 
+      	|| EXIST("$(MZSCHEME)\collects\scheme\base.rkt") \
+      	|| EXIST("$(MZSCHEME)\collects\racket\base.rkt")
 # for MzScheme >= 4 we need to include byte code for basic Scheme stuff
 MZSCHEME_EXTRA_DEP = mzscheme_base.c
 CFLAGS = $(CFLAGS) -DINCLUDE_MZSCHEME_BASE
@@ -1170,7 +1171,11 @@
 	$(CC) $(CFLAGS) if_mzsch.c \
 		-DMZSCHEME_COLLECTS=\"$(MZSCHEME:\=\\)\\collects\"
 mzscheme_base.c:
+!IF "$(MZSCHEME_MAIN_LIB)" == "racket"
+	$(MZSCHEME)\raco ctool --c-mods mzscheme_base.c ++lib scheme/base
+!ELSE
 	$(MZSCHEME)\mzc --c-mods mzscheme_base.c ++lib scheme/base
+!ENDIF
 
 $(OUTDIR)/if_python.obj: $(OUTDIR) if_python.c if_py_both.h $(INCL)
 	$(CC) $(CFLAGS) $(PYTHON_INC) if_python.c