Even though I set USE_GCC=yes in make.conf, math/p5-Bit-Vector links using cc. It compiles all objects using gcc47. The result is /usr/bin/ld is used for linking, and doesn't understand the relocations generated by gcc47 (R_PPC_TLSGD/R_PPC_TLSLD), which newer binutils (post-2007) understand, so the build ultimately fails.
Over to maintainer
If I try I get a proper error message ===> p5-Bit-Vector-7.4 Unknown version of GCC specified (USE_GCC=YES). *** Error code 1 So I think this could closed.
(In reply to w.schwarzenfeld from comment #2) It might be case sensitive. But, yes, I think this can be closed. I did add the relocations to base binutils back in 2014.