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-rw-r--r--win32/Makefile.sub3
1 files changed, 3 insertions, 0 deletions
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 094ce90c78a..e94b0c98ae6 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -209,6 +209,9 @@ OUTFLAG = -Fe
!if !defined(COUTFLAG)
COUTFLAG = -Fo
!endif
+!if !defined(CPPOUTFLAG)
+CPPOUTFLAG = -Fi
+!endif
!if !defined(CSRCFLAG)
CSRCFLAG = -Tc
!endif