--- ./main.c~	2009-06-22 19:51:40.000000000 +0900
+++ ./main.c	2009-06-22 19:54:30.000000000 +0900
@@ -234,6 +234,9 @@
 #define USE_SYSV_UTMP
 #define setpgrp setpgid
 #endif
+#ifdef __DARWIN__
+#define setpgrp setpgid
+#endif
 #endif	/* } !SYSV */
 
 #ifdef _POSIX_SOURCE