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-rw-r--r--ext/POSIX/POSIX.xs1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/POSIX/POSIX.xs b/ext/POSIX/POSIX.xs
index 33f9b88adb..9702923c6d 100644
--- a/ext/POSIX/POSIX.xs
+++ b/ext/POSIX/POSIX.xs
@@ -104,6 +104,7 @@
#else
#if defined (CYGWIN32)
# define tzname _tzname
+# undef MB_CUR_MAX /* XXX: bug in b20.1 */
#endif
#if defined (WIN32)
# undef mkfifo