--- doc/gphelp.in.orig	2020-09-21 00:29:25.000000000 -0600
+++ doc/gphelp.in	2020-10-19 15:06:32.498979687 -0600
@@ -43,8 +43,8 @@ $datadir= "@datadir@";
 #
 $wwwsite= "http://pari.math.u-bordeaux.fr/";
 
-$xdvi = $ENV{GPXDVI} || "xdvi";
-$xdviref = $ENV{GPXDVIREF} || "$xdvi -paper 29.7x21cm";
+$xdvi = $ENV{GPXDVI} || "xdg-open";
+$xdviref = $ENV{GPXDVIREF} || "$xdvi";
 $gzip = "gzip";
 $zcat = "$gzip -dc";
 $bzip = "bzip2";