What is the correct directory? Trying to work it out from the various directories in that compilation command: $ pwd /Users/johncolvin/Git/GDC/objdir $ find . -name x86_64-apple-darwin15.0.0 -type d ./prev-x86_64-apple-darwin15.0.0/i386/libstdc++-v3/include/x86_64-apple-darwin15.0.0 ./prev-x86_64-apple-darwin15.0.0/libstdc++-v3/include/x86_64-apple-darwin15.0.0 ./stage1-x86_64-apple-darwin15.0.0/i386/libstdc++-v3/include/x86_64-apple-darwin15.0.0 ./stage1-x86_64-apple-darwin15.0.0/libstdc++-v3/include/x86_64-apple-darwin15.0.0 ./x86_64-apple-darwin15.0.0 ./x86_64-apple-darwin15.0.0/i386/libstdc++-v3/include/x86_64-apple-darwin15.0.0 ./x86_64-apple-darwin15.0.0/libstdc++-v3/include/x86_64-apple-darwin15.0.0