diff -ur prboom-plus-2.5.0.3.orig/src/r_demo.c prboom-plus-2.5.0.3/src/r_demo.c
--- prboom-plus-2.5.0.3.orig/src/r_demo.c	2009-06-11 13:25:42 +0300
+++ prboom-plus-2.5.0.3/src/r_demo.c	2009-07-31 03:42:56 +0300
@@ -156,7 +156,7 @@
 
 #ifndef _MSC_VER
 #ifdef HAVE_LIBPCREPOSIX
-#include "pcreposix.h"
+#include "pcre/pcreposix.h"
 #endif
 #else // _MSC_VER
 #define HAVE_LIBPCREPOSIX 1