diff -up asymptote-1.63/settings.cc.orig asymptote-1.63/settings.cc

--- asymptote-1.63/settings.cc.orig	2009-02-17 21:55:36.000000000 -0500

+++ asymptote-1.63/settings.cc	2009-02-18 10:16:17.000000000 -0500

@@ -80,11 +80,11 @@ const bool haveglut=false;

 bool msdos=false;

 const char *HOME="HOME";

 const char pathSeparator=':';

-string defaultPSViewer="gv";

+string defaultPSViewer="evince";

 #ifdef __APPLE__

 string defaultPDFViewer="open";

 #else  

-string defaultPDFViewer="acroread";

+string defaultPDFViewer="evince";

 #endif  

 string defaultGhostscript="gs";

 string defaultPython;