The cfep/asir in this distribution works only on Intel Mac's. (It does not run on old PPC Mac's.) Install: 1. Install "xcode" from MacOS install disk. It is under the optional tools. The procedure is explained, for example (2010.06.09), in http://www.askdavetaylor.com/how_to_install_apple_developer_tools_cc_gcc_mac_os_x.html If you do not install it, you will get the error "cpp is not found. End of file is detected" when you load packages in cfep/asir. 2. Drag and drop "cfep" at any place you want. Then, the installation is done. Uninstall: Move cfep to the trash.