I've installed bro (version 0.5a) on linux and on solaris machines
Here follows some feedback about problems I've encountered.
1) the files doc/* are not installed in /usr/local/directory when using
2) directory /usr/local/bro should first be created before using "make
install" (otherwise he copy all files to the file /usr/local/bro)
3) on Solaris 2.5.1, yacc doesn't want to compile parse.y
A workaround was to install bison.
If you want to contribute patches for these (or at lesat for 1 & 2),
that would be great. I don't ever formally install bro myself, so
don't have occasion to use or debug these steps.