-#ifndef _group_member_h_
-#define _group_member_h_ 1
+#ifndef GROUP_MEMBER_H_
+# define GROUP_MEMBER_H_ 1
+
+# ifndef PARAMS
+# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
+# define PARAMS(Args) Args
+# else
+# define PARAMS(Args) ()
+# endif
+# endif
int
- group_member ();
+ group_member PARAMS ((gid_t));
-#endif /* _group_member_h_ */
+#endif /* GROUP_MEMBER_H_ */