Had to do this: CC=clang CXX=clang++ ./build.sh -j release to get it started to compile (as it seems it had cc pointing to gcc and it did not understand some,

Had to do this: CC=clang CXX=clang++ ./build.sh -j release to get it started to compile (as it seems it had cc pointing to gcc and it did not understand some, apparently clang-specific flags).