libc.so.6 vs. libc.so.7 for compatibility reasons

[O. Hartmann]

Tried to install ports/java/diablo-jdk15 and it failed to to the lack of
libc.so.6 it expects.

This night I'll try /etc/libmap.conf. but I want to ask for a better,
cleaner way to do so ...

Regards,
Oliver