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-rw-r--r--ext/sdbm/_sdbm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/sdbm/_sdbm.c b/ext/sdbm/_sdbm.c
index 92c96f26d0..d8bfae80b2 100644
--- a/ext/sdbm/_sdbm.c
+++ b/ext/sdbm/_sdbm.c
@@ -103,7 +103,7 @@ static int duppair proto((char *, datum));
/*
* externals
*/
-#if !defined(sun) && !defined(MSDOS) && !defined(_WIN32)
+#if !defined sun && !defined MSDOS && !defined _WIN32 && !defined __CYGWIN__
extern int errno;
#endif