I tried that. First I had to install howl. I found a Debian package of 0.9.5 and it seems to install ok. Funny enough, configure will complain about some other include not available if howl is not installed.
Nevertheless, as howl includes are in /usr/include/howl, I have to configure with –with-howl-includes=/usr/include/howl. I will then get some errors. I will try to look at the code and fix them. Is that possible or is something wrong with my howl?