apart from that, I follow the procedure in the archive directory
$ ./autogen
$ ./ configure (or with --enable-alsa)
$ make
$ sudo make install
don't what to try next...
(that's silly, it worked fine on the first board. must have typed a magic shell command)
if anyone has a suggestion... ?
(i feel like doing my first steps outside pd-extended, even if I have been using pd for 10 years... some us might prefer ready-to-use environnements... but if it's the price of opensource/community developped software, I want to try to learn...)