t/conftest.c:1:17: error: mad.h: No such file or directory t/conftest.c:2:23: error: lame/lame.h: No such file or directory You may not have installed the LAME or MAD libraries and header files, or your compiler installation is flawed. Please review the error messages from the compiler above. You can change the default compiler by setting the $CC environment variable in your shell.