System V versions must call setpgrp() with no arguments, to comply with

prototyping typically in <unistd.h>.  Otherwise the compile fails, at
least with gcc.

gdb/ChangeLog

@@ -1,5 +1,9 @@
 Thu Oct 24 01:32:51 1991  Fred Fish  (fnf at cygnus.com)
 
+	* infrun.c (child_create_inferior): System V versions must call
+	setpgrp() with no arguments, to comply with prototyping typically
+	in <unistd.h>.
+
 	* munch: Add support for SVR4 style nm output.
 
 	* dbxread.c, mipsread.c symmisc.c, symtab.c:  Remove the object

gdb/infrun.c

@@ -534,7 +534,11 @@ child_create_inferior (exec_file, allargs, env)
 
 #ifdef TIOCGPGRP
       /* Run inferior in a separate process group.  */
+#ifdef USG
+      debug_setpgrp = setpgrp ();
+#else
       debug_setpgrp = setpgrp (getpid (), getpid ());
+#endif
       if (debug_setpgrp == -1)
 	 perror("setpgrp failed in child");
 #endif /* TIOCGPGRP */