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-rw-r--r--crawl-ref/source/AppHdr.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/crawl-ref/source/AppHdr.h b/crawl-ref/source/AppHdr.h
index 4177673947..700bfc2c0c 100644
--- a/crawl-ref/source/AppHdr.h
+++ b/crawl-ref/source/AppHdr.h
@@ -180,6 +180,10 @@
#include <dos.h>
+ // Use Perl-compatible regular expressions. libpcre must be available and
+ // linked in. This is optional.
+ #define REGEX_PCRE
+
#elif defined(WIN32CONSOLE) || defined(WIN32TILES)
#if defined(WIN32CONSOLE)
#include "libw32c.h"