Using built-in specs. COLLECT_GCC=./cc COLLECT_LTO_WRAPPER=/gcc5/libexec/gcc/x86_64-unknown-linux-gnu/5.3.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ./configure --prefix=/gcc5 --enable-languages=c,c++ --enable-checking=release --disable-multilib Thread model: posix gcc version 5.3.0 (GCC)