===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/make/cond.c,v
retrieving revision 1.51
retrieving revision 1.52
diff -c -r1.51 -r1.52
*** src/usr.bin/make/cond.c	2016/10/21 16:12:38	1.51
--- src/usr.bin/make/cond.c	2017/06/21 00:11:36	1.52
***************
*** 1,4 ****
! /*	$OpenBSD: cond.c,v 1.51 2016/10/21 16:12:38 espie Exp $	*/
  /*	$NetBSD: cond.c,v 1.7 1996/11/06 17:59:02 christos Exp $	*/
  
  /*
--- 1,4 ----
! /*	$OpenBSD: cond.c,v 1.52 2017/06/21 00:11:36 espie Exp $	*/
  /*	$NetBSD: cond.c,v 1.7 1996/11/06 17:59:02 christos Exp $	*/
  
  /*
***************
*** 291,296 ****
--- 291,299 ----
  {
  	bool result;
  	char *path;
+ 
+ 	if (arg->s == arg->e)
+ 		Parse_Error(PARSE_FATAL, "Empty file name in .if exists()");
  
  	path = Dir_FindFilei(arg->s, arg->e, defaultPath);
  	if (path != NULL) {