Put simply: when emerging kde-base/libksirtet, despite the fact that _something_ is compiled, absolutely nothing useful is installed. output of 'qlist libksirtet': /usr/share/doc/libksirtet-3.5.2/AUTHORS.gz /usr/share/doc/libksirtet-3.5.2/README.gz /usr/share/doc/libksirtet-3.5.2/ChangeLog.gz Nothing depends on these files, and the contents of these files are identical to the files of the same name installed by kde-base/libkdegames. Unless I'm missing something, the ebuild seems to be utterly useless, so it may as well be removed :-)
Thanks for reporting, the package is gone now :)