test for presence of stddef.h
separate arg requirements for getpgrp() and setpgrp()
diff --git a/config.h.in b/config.h.in
index d91fbd9..779ea63 100644
--- a/config.h.in
+++ b/config.h.in
@@ -90,10 +90,12 @@
 /* Define to `long' if <time.h> doesn't define.  */
 #undef clock_t
 
-/* Define if getpgrp() must be called as getpgrp(0)
-   and (consequently) setpgrp() as setpgrp(0, 0). */
+/* Define if getpgrp() must be called as getpgrp(0). */
 #undef GETPGRP_HAVE_ARG
 
+/* Define if setpgrp() must be called as setpgrp(0, 0). */
+#undef SETPGRP_HAVE_ARG
+
 /* Define this if your time.h defines altzone */
 #undef HAVE_ALTZONE
 
@@ -237,6 +239,9 @@
 /* Define if you have the <stdarg.h> header file.  */
 #undef HAVE_STDARG_H
 
+/* Define if you have the <stddef.h> header file.  */
+#undef HAVE_STDDEF_H
+
 /* Define if you have the <stdlib.h> header file.  */
 #undef HAVE_STDLIB_H