A Makefile exists in the main OYSTER directory which simplifies the installation. The supported platforms are HP-UX, Linux, SunOS, and MacOSX. Make sure your platform is one of those, using the uname UNIX command. The Makefile will use uname to determine which of the pre-installed Makefiles in the library directories are used for compilation. The only Makefile which still has to be edited manually before running make is Makefile.uname.in in source/rsi which needs the path to the local IDL installation, as well as the location of the libg2c.a library file. Then run the make command in the home folder.