diff --git a/yatexprc.el b/yatexprc.el
index a3ae3b4..1dcebc1 100644
--- a/yatexprc.el
+++ b/yatexprc.el
@@ -1,7 +1,7 @@
 ;;; yatexprc.el --- YaTeX process handler -*- coding: sjis -*-
 ;;; 
 ;;; (c)1993-2018 by HIROSE Yuuji.[yuuji@yatex.org]
-;;; Last modified Wed May 30 08:32:30 2018 on firestorm
+;;; Last modified Sat Oct  5 12:44:16 2019 on firestorm
 ;;; $Id$
 
 ;;; Code:
@@ -1341,6 +1341,8 @@
        (setq fname (substring fname 0 (rindex fname ?.))))
      ext)))
 
+(defvar YaTeX-proc-feed-relative t
+  "Non-nil means feed process relative path name of target file.")
 (defun YaTeX-get-latex-command (&optional switch)
   "Specify the latex-command name and its argument.
 If there is a line which begins with string: \"%#!\", the following
@@ -1360,7 +1362,9 @@
 	  (cond
 	   (YaTeX-parent-file
 	    (if YaTeX-dos (expand-file-name YaTeX-parent-file)
-	      YaTeX-parent-file))
+	      (if YaTeX-proc-feed-relative
+		  (file-relative-name YaTeX-parent-file)
+		YaTeX-parent-file)))
 	   (t (save-excursion
 		(YaTeX-visit-main t)
 		(file-name-nondirectory (buffer-file-name)))))