Using built-in specs. COLLECT_GCC=./cc COLLECT_LTO_WRAPPER=/home/gcc4/libexec/gcc/x86_64-unknown-linux-gnu/4.9.4/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ./configure --disable-multilib --enable-checking=release --prefix=/home/gcc4 Thread model: posix gcc version 4.9.4 (GCC)