hi mike, > src/Interpreter.cpp:21:18: error: base.c: No such file or directory you need to put the bin directory of plt scheme to the path. something like this could go to your ~/.bash_profile file: PATH=$PATH:/opt/local/bin:/Applications/PLT\ Scheme\ v4.1.4/bin/ the binary plt scheme distribution is ok, you don't need to compile it from source. best, gabor