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-rw-r--r--crawl-ref/source/libunix.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/crawl-ref/source/libunix.cc b/crawl-ref/source/libunix.cc
index 9dbf1db8e0..133eb70620 100644
--- a/crawl-ref/source/libunix.cc
+++ b/crawl-ref/source/libunix.cc
@@ -63,7 +63,9 @@ static struct termios game_term;
// Its best if curses comes at the end (name conflicts with Solaris). -- bwr
#ifndef CURSES_INCLUDE_FILE
+ #ifndef _XOPEN_SOURCE_EXTENDED
#define _XOPEN_SOURCE_EXTENDED
+ #endif
#include <curses.h>
#else
#include CURSES_INCLUDE_FILE