INSTALL instructions for Numerical Recipes in C++ and C (UNIX/Linux): Along with this INSTALL file, three files, cpp.tar c-ansi.tar and c-kr.tar, were unpacked. The first is the C++ release; the second is the ANSI C release; the third is the obsolete (traditional) K&R C release. You can install any or all of these releases. Their directory trees do not conflict. 1. Move the tar file(s) to the desired installation directory. The recommended choice is /usr/local/src (which you may need to create), but any directory is fine. 2. In the desired directory, execute the command tar xvf cpp.tar and/or tar xvf c-ansi.tar and/or tar xvf c-kr.tar An extensive directory tree will be created. If you unpack more than one file, their directory trees will be non-interfering. 3. If you want, you can now delete the tar(s): rm -f cpp.tar rm -f c-ansi.tar rm -f c-kr.tar HOWEVER, some future downloadable "free upgrades" may require that you keep a copy of the tar file(s), so a better idea is to save them on backup media somewhere. 4. A new subdirectory will have been created. Look inside it and read the README file, or files in the doc/ directory, for further information.