qcad 1.5.1 ebuild is also installing CVS directories located in the tar.gz file. For example: /usr/share/qcad/fonts/CVS/ /usr/share/qcad/libraries/CVS/ ...
The new qcad 1.5.4 ebuild no longer does this, I believe. Please confirm.
AFAICS this has been fixed. Please reopen the bugreport if it isn't so for you.