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-rw-r--r--winbuild/MakefileBuild.vc2
1 files changed, 1 insertions, 1 deletions
diff --git a/winbuild/MakefileBuild.vc b/winbuild/MakefileBuild.vc
index 5ec638f85..800bebcce 100644
--- a/winbuild/MakefileBuild.vc
+++ b/winbuild/MakefileBuild.vc
@@ -172,7 +172,7 @@ USE_IDN = true
!ENDIF
!IF "$(USE_IDN)"=="true"
-CFLAGS = $(CFLAGS) /DUSE_WIN32_IDN
+CFLAGS = $(CFLAGS) /DUSE_WIN32_IDN /DWANT_IDN_PROTOTYPES
LFLAGS = $(LFLAGS) Normaliz.lib
!ENDIF