diff '--color=auto' -r -U3 asymptote-2.92.orig/settings.cc asymptote-2.92/settings.cc
--- a/settings.cc
+++ b/settings.cc
@@ -117,14 +117,14 @@ string defaultPSViewer="open";
 string defaultPDFViewer="open";
 string defaultHTMLViewer="open";
 #else
-string defaultPSViewer="evince";
-string defaultPDFViewer="evince";
-string defaultHTMLViewer="google-chrome";
+string defaultPSViewer="xdg-open";
+string defaultPDFViewer="xdg-open";
+string defaultHTMLViewer="xdg-open";
 #endif
 string defaultGhostscript="gs";
 string defaultGhostscriptLibrary="";
-string defaultDisplay="display";
-string defaultAnimate="magick";
+string defaultDisplay="xdg-open";
+string defaultAnimate="xdg-open";
 void queryRegistry() {}
 const string dirsep="/";
 
