r = pchen, a = pchen

EROFS is not defined in VisualAge so it breaks our Tinderbox

modules/libreg/src/reg.c

@@ -354,7 +354,9 @@ static REGERR nr_OpenFile(char *path, FILEHANDLE *fh)
 #ifdef XP_MAC
         case opWrErr:
 #else
+#ifndef XP_OS2_VACPP
         case EROFS:     /* read-only file system */
+#endif
         case EACCES:    /* file in use or read-only file*/
 #endif
             /* try read only */