a2ps shared files are installed into /usr/share/a2ps/a2ps but the configuration file (/etc/a2ps/a2ps.cfg) is configured to /usr/share/a2ps the result is that a2ps will be broken until you fix the configuration file.
They are not: at least app-text/a2ps-4.13b-r4 installs all shared files under /usr/share/a2ps; a2ps.cfg points to that same place. Closing the bug.. George
I just saw the same thing as george.