Luigi,
I actually recreated a small environment on my Rpi and was able to compile an optimized version of SF19 for me, thanks anyway.
I haven't however compiled a version without the embedded net.
I know you're a super-expert so probably you don't need me reminding that SF19 without an embedded net can't make use of the "old" evaluation fuction, since this has been stripped from the code long ago. The reaason you created a version without the embedded net, I think was to leave a user the chance to specify what external net to use, by means of the specific UCI parameter. Am I correct?
Thanks!
Andrea.