Version 0.15.7 is available upstream. Please consider updating!
It seems that version 0.15.7 is available upstream, while the latest version in the Gentoo tree is 0.15.5. You think this warning is false? Read more about it here.
This is the core library of the Gtk2Hs suite of libraries for Haskell
based on Gtk+. Gtk+ is an extensive and mature multi-platform toolkit
for creating graphical user interfaces.