diff -up asymptote-2.45/settings.cc.settings asymptote-2.45/settings.cc
--- asymptote-2.45/settings.cc.settings	2018-07-24 13:08:38.016579901 -0400
+++ asymptote-2.45/settings.cc	2018-07-24 13:10:08.644725558 -0400
@@ -91,11 +91,11 @@ bool msdos=false;
 string HOME="HOME";
 string docdir=ASYMPTOTE_DOCDIR;
 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 defaultGhostscriptLibrary="";