just tried on my own and only a few languages compiled. /Users/bryandunphy/Downloads/gcc-8.2.0 is the destination of svn checkout svn://gcc.gnu.org/svn/gcc/trunk <svn://gcc.gnu.org/svn/gcc/trunk> The configure command was: /Users/bryandunphy/Downloads/gcc-8.2.0/configure --prefix=$HOME/gcc-built --build=x86_64-apple-darwin17.7.0 --host=x86_64-apple-darwin17.7.0 --target=x86_64-apple-darwin17.7.0 CC=/opt/gcc-8.1.0/bin/gcc CXX=/opt/gcc-8.1.0/bin/g++ bootstrap The contents of $HOME/gcc-built are at https://gist.github.com/Bryan-Dunphy/c9abf6a70a8f14025fae666190f4d3bd The ls -lR of /Library/Developer/CommandLineTools/usr/bin is available at https://gist.github.com/Bryan-Dunphy/8466ad4ce4921dd3e02a04ad81b04852 <https://gist.github.com/Bryan-Dunphy/8466ad4ce4921dd3e02a04ad81b04852> The ls -lR of /opt/gcc-8.1.0 is available at https://gist.github.com/Bryan-Dunphy/f76e6b16933efa05e9de399cdb963077 <https://gist.github.com/Bryan-Dunphy/f76e6b16933efa05e9de399cdb963077>