--- old/make/windows/makefiles/vm.make	Sat Jun  1 09:41:33 2013
+++ new/make/windows/makefiles/vm.make	Sat Jun  1 09:41:32 2013
@@ -31,7 +31,11 @@
 ALTSRC=$(WorkSpace)\src\closed
 
 !ifdef RELEASE
+!ifdef DEVELOP
+CXX_FLAGS=$(CXX_FLAGS) /D "DEBUG"
+!else
 CXX_FLAGS=$(CXX_FLAGS) /D "PRODUCT"
+!endif
 !else
 CXX_FLAGS=$(CXX_FLAGS) /D "ASSERT"
 !endif
@@ -136,6 +140,8 @@
 
 !if "$(USE_PRECOMPILED_HEADER)" != "0"
 CXX_USE_PCH=/Fp"vm.pch" /Yu"precompiled.hpp"
+# VS2012 requires this object file to be listed:
+LD_FLAGS=$(LD_FLAGS) _build_pch_file.obj
 !else
 CXX_USE_PCH=$(CXX_DONT_USE_PCH)
 !endif
@@ -182,7 +188,7 @@
 
 # Special case files not using precompiled header files.
 
-c1_RInfo_$(Platform_arch).obj: $(WorkSpace)\src\cpu\$(Platform_arch)\vm\c1_RInfo_$(Platform_arch).cpp
+c1_RInfo_$(Platform_arch).obj: $(WorkSpace)\src\cpu\$(Platform_arch)\vm\c1_RInfo_$(Platform_arch).cpp 
 	 $(CXX) $(CXX_FLAGS) $(CXX_DONT_USE_PCH) /c $(WorkSpace)\src\cpu\$(Platform_arch)\vm\c1_RInfo_$(Platform_arch).cpp
 
 os_windows.obj: $(WorkSpace)\src\os\windows\vm\os_windows.cpp