--- ksh-openbsd_cvs/sh.h 2010-02-23 12:49:21.000000000 +0100 +++ ksh-openbsd_cvs.new/sh.h 2010-04-01 21:01:24.135232661 +0200 @@ -16,6 +16,7 @@ #include <stdbool.h> #include <stddef.h> #include <stdlib.h> +#define __USE_GNU /* needed for setresuid() and setresgid() */ #include <unistd.h> #include <string.h> #include <stdarg.h>