Ok, I'm going on.
I tried "git checkout", but sorry I'm not used to : what's that for ?
And finally, the same error occured.
So I looked after the same error code on internet and found this :
https://github.com/ellzey/libevhtp/issues/127I installed "libssl-dev" and it worked !
OK, OK... some warnings appeared, but for developpers eyes. Developpers, if you are interested : tell me !
Then I ran "bitmonerod" and it synchronized !
There is just this annoying message (for developpers eyes) :
[1433872546] libunbound[17776:0] info: warning: unsupported algorithm for trust anchor . DS IN
[1433872546] libunbound[17776:0] warning: trust anchor . has no supported algorithms, the anchor is ignored (check if you need to upgrade unbound and openssl)
Thank's GingerAle.