"Once these are installed, you can edit the file 'SConstruct' in the top level source directory for setting compiler flags etc., and run the command 'scons -j 4' for building the emulator. The resulting executable files (plus4emu and the utilities listed above) can be copied to any directory that is in the PATH; on MacOS X, an .app package is created in 'plus4emu.app'.

When installing the first time, you also need to set up configuration files and ROM images:

• copy all .rom files from the roms directory to ~/.plus4emu/roms (or, in the case of MacOS X, ~/Library/Application Support/plus4emu/roms)
• after installing the ROM images, run 'plus4emu', and click OK to the windows that pop up asking for the base directory of configuration and data files, and if configuration files should be installed

It is possible to reinstall configuration files later by running the 'p4makecfg' utility."