diff -U3 -r asymptote-2.85.orig/settings.cc asymptote-2.85/settings.cc
--- asymptote-2.85.orig/settings.cc	2023-02-09 11:53:32.000000000 +0700
+++ asymptote-2.85/settings.cc	2023-02-16 12:55:18.343703131 +0700
@@ -101,13 +101,13 @@
 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 defaultDisplay="xdg-open";
 string defaultAnimate="animate";
 void queryRegistry() {}
 const string dirsep="/";