ah I see, I always have a hard time remembering how to do this-
depending on how your openssl is compiled, you'll have a directory, probably /etc/ssl (check with http://gagravarr.org/writing/openssl-certs/others.shtml
in that directory you do something like:
ln -s ~/my_ca.crt `openssl x509 -hash -noout -in my_ca.crt`.0
or you can just copy ~/my_ca.crt to the file name that openssl x509 -hash generates for you.
There's also a way you can configure your own certs directory, I think via openssl.cnf. You may have to set like OPENSSL_CONF=/home/whoever/.openss.cnf. (double check that env variable name, but I think thats right)