==> Starting build()...
---> lib
<--- lib
---> ext
/usr/bin/ruby /home/bukowski/AUR/ruby-libnotify/src/ruby-libnotify-0.4.1/ext/extconf.rb 
ERROR: no pkg-config.rb file found, please install Ruby/GLib2
[ http://ruby-gnome2.sourceforge.jp/ ]
<--- ext
---> lib
<--- lib
---> ext
make 
make: *** No targets specified and no makefile found.  Stop.
'system make ' failed
Try 'ruby setup.rb --help' for detailed usage.
    Aborting...