The process you suggested me blast, worked just really really fine!
That's the output of bzflag -version:
BZFlag client 188.8.131.5211021-DEVEL-linux-gnu-SDL (protocol 0221) http://BZFlag.org/
Copyright (c) 1993-2011 Tim Riker
it's liked to SDL! Good. I successfully edited the scoreboard.cxx and also the data folder in bzflag-trunk for textures
All is fine now... Thank you all mates.
However i'm a bit confused: What you told me blast, isn't so much different by downloading the source and compiling like I was trying to do... So, why now work correctly and before not?
Also: I'll try to compile bzflag by downloading the source and than "sudo apt-get build-dep bzflag" before compiling; naturally installing also all the packages requested in the README.Linux file (just in another computer). I'm curious to see what happen.
Problem "apparently" solved