Here's a log of my cross-compiling effort of the latest public Bro distribution to run on a linksys wireless router using the openwrt.org distribution. The goal here was not to cross compile the whole bro environment, but to create a bro binary that will function as expected on the box. The scripts, etc. are copied over from a working installation.
The log appears to be one interrupted path of forward progress, whereas in reality, there were numerous false starts, blind alleys, head-scratching, and dumb luck involved.
Hopefully, this will be of use to others attempting porting, etc. to odd platforms. BTW the shell used is bash, if you're using another one, YMMV
Still to be compiled are utilities (cf, etc.)