A new version of dev-scheme/gauche-gtk has been released which is supposed to fix compilation with newer gtk versions, among other things. See sourceforge page http://sourceforge.net/project/showfiles.php?group_id=25227 and additionally a thread on the project's mailinglist: http://sourceforge.net/mailarchive/forum.php?thread_name=46A0A490.8000001%40fsij.org&forum_name=gauche-devel Reproducible: Always
License of some parts of gauche-gtk-0.5.7 are not clear, so we cannot import this version to portage.