Rrrright ...
cd /opt/kde/lib
ln -fs /path/to/aegypten-libgpgme/libgpgme.so libqgpgme.so.0
and all is well with the world. KMail now does GPG and S/MIME
happily. :}
Why didn't I think of the possibility that KDE has a libgpgme of
its own earlier?
Cheers,
Tink