Source
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--- src/rxvt.h 2006-10-01 21:50:38.000000000 +0000
+++ src/rxvt.h.new 2007-06-14 22:59:53.000000000 +0000
# define ut_name ut_user
#endif
+/* Need this to get prototype for openpty(), at least on Mac OS X 10.4 */
+#ifdef OS_DARWIN
+# include <util.h>
+#endif
+
#ifdef TTY_GID_SUPPORT
# include <grp.h>
#endif