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-rw-r--r--Build/source/texk/makeindexk/mkind.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/Build/source/texk/makeindexk/mkind.h b/Build/source/texk/makeindexk/mkind.h
index e034da8bc85..d8e331073d8 100644
--- a/Build/source/texk/makeindexk/mkind.h
+++ b/Build/source/texk/makeindexk/mkind.h
@@ -383,6 +383,7 @@ ensuing.
#define ARAB 2
#define ALPL 3
#define ALPU 4
+#undef DUPLICATE /* may already be defined for WIN32 */
#define DUPLICATE 9999
#define SYMBOL -1