In details, here is what Amanieu tolds me to do:
1) Download the latest universal zip from http://sourceforge.net/projects/unvanqu ... urce=files. It's unvanquished_0.37.0.zip as of today.
2) Unzip it.
3) Inside unvanquished_0.37.0 folder, unzip linux64.zip.
4) Inside linux64 folder rename nacl_loader to sel_ldr and copy it with irt_core-x86_64.nexe and nacl_helper_bootstrap.
5) Open your favorite file browser with root privileges.
6) Create the /usr/lib/nacl folder and paste inside it sel_ldr, irt_core-x86_64.nexe and nacl_helper_bootstrap.
7) Close your file browser.
8) Launch the game like you always do and profit! 
