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-rw-r--r--contrib/tsearch2/rewrite.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/contrib/tsearch2/rewrite.c b/contrib/tsearch2/rewrite.c
index 4d7294cd74a..e7b5045c9e9 100644
--- a/contrib/tsearch2/rewrite.c
+++ b/contrib/tsearch2/rewrite.c
@@ -174,6 +174,11 @@ clean_NOT_v2(ITEM * ptr, int4 *len)
return plaintree(clean_NOT_intree(root), len);
}
+
+#ifdef V_UNKNOWN /* exists in Windows headers */
+#undef V_UNKNOWN
+#endif
+
#define V_UNKNOWN 0
#define V_TRUE 1
#define V_FALSE 2