1.10 (current stable) is really old, 2.2 has been in the tree since august. 1.10 is lacking some major features, like passing arguments to the cgi-wrapper-script. Compiles and runs fine with FEATURES="collission-protect test stricter" on my amd64-server (mainly stable-amd64).
x86 stable
amd64 stable, thanks to gentoofan23 for testing
ppc stable