diff -U2 --recursive maxima-5.13.0.orig/interfaces/emacs/misc/bookmode.el maxima-5.13.0/interfaces/emacs/misc/bookmode.el
--- maxima-5.13.0.orig/interfaces/emacs/misc/bookmode.el	2000-05-08 13:09:44.000000000 +0700
+++ maxima-5.13.0/interfaces/emacs/misc/bookmode.el	2007-08-28 22:45:07.000000000 +0700
@@ -681,5 +681,5 @@
 		  (and tem
 		       (list (concat "View "(nth 1 tem))
-			     'call-process  "ghostview" nil nil nil
+			     'call-process  "xdg-open" nil nil nil
 			     (expand-file-name(nth 1 tem))
 			     ))
@@ -706,5 +706,5 @@
 			  (cond ((looking-at "%PS") "")
 				(t "gzip -dc | "))
-			  "ghostview -")
+			  "xdg-open -")
 			 
 	)))
diff -U2 --recursive maxima-5.13.0.orig/interfaces/xmaxima/Tkmaxima/Constants.tcl maxima-5.13.0/interfaces/xmaxima/Tkmaxima/Constants.tcl
--- maxima-5.13.0.orig/interfaces/xmaxima/Tkmaxima/Constants.tcl	2006-10-02 05:42:48.000000000 +0700
+++ maxima-5.13.0/interfaces/xmaxima/Tkmaxima/Constants.tcl	2007-08-28 22:46:44.000000000 +0700
@@ -144,7 +144,7 @@
     image/png  netmath
     image/jpeg netmath
-    application/postscript "ghostview -safer %s"
-    application/pdf "acroread %s"
-    application/x-dvi "xdvi %s"
+    application/postscript "xdg-open -safer %s"
+    application/pdf "xdg-open %s"
+    application/x-dvi "xdg-open %s"
 }
 set maxima_priv(imagecounter) 0