lilypond-usage: Extra configuration for Evince

 
 Extra configuration for Evince
 ..............................
 
 If ‘gnome-open’ works, but Evince still refuses to open point and click
 links due to denied permissions, you might need to change the Apparmor
 profile of Evince which controls the kind of actions Evince is allowed
 to perform.
 
    For Ubuntu, the process is to edit the file
 ‘/etc/apparmor.d/local/usr.bin.evince’ and append the following lines:
      # For Textedit links
      /usr/local/bin/lilypond-invoke-editor Cx -> sanitized_helper,
 
    After adding these lines, call
 
      sudo apparmor_parser -r -T -W /etc/apparmor.d/usr.bin.evince
 
 Now Evince should be able to open point and click links.  It is likely
 that similar configurations will work for other viewers.