Fidelio was developed on Slackware Linux iand Debian/unstable, but it has been reported to work on RedHat,SuSe and FreeBSD. Please note that it won't work very well on 64-bit machines where structure elements are padded to 8-byte-multiples. Fidelio is available under the GNU General Public License.
To build the sources, you will need the following packages installed:
Latest stable version
Installation is the usual ./configure && make && make install.
Who knows, you might find that some earlier version works better for you.
Please report errors and omissions to email@example.com