--- ray/src/common/fropen.c	2003/05/13 17:58:32	2.10
+++ ray/src/common/fropen.c	2013/12/19 16:38:12	2.16
@@ -1,32 +1,33 @@
 #ifndef lint
-static const char	RCSid[] = "$Id: fropen.c,v 2.10 2003/05/13 17:58:32 greg Exp $";
+static const char	RCSid[] = "$Id: fropen.c,v 2.16 2013/12/19 16:38:12 greg Exp $";
 #endif
 /*
  * Find and open a Radiance library file.
  *
- *  External symbols declared in standard.h
+ *  External symbols declared in rtio.h
  */
 
 #include "copyright.h"
 
 #include <stdio.h>
 
+#include "rtio.h"
 #include "paths.h"
 
 
 FILE *
-frlibopen(fname)		/* find file and open for reading */
-register char  *fname;
+frlibopen(			/* find file and open for reading */
+	char  *fname
+)
 {
-	extern char  *strcpy(), *getrlibpath();
 	FILE  *fp;
-	char  pname[MAXPATH];
-	register char  *sp, *cp;
+	char  pname[PATH_MAX];
+	char  *sp, *cp;
 
 	if (fname == NULL)
 		return(NULL);
 
-	if (ISDIRSEP(fname[0]) || fname[0] == '.')	/* absolute path */
+	if (ISABS(fname) || fname[0] == '.')	/* absolute path */
 		return(fopen(fname, "r"));
 						/* check search path */
 	sp = getrlibpath();