This file is part of the port of the Plan 9 APE libraries to use GCC. These libraries are distributed under the terms of the Plan 9 License, which you should already have a copy of.
APE is the Ansi Posix Environment of Plan 9. Plan 9 uses its own system call interface, and APE is provided in order to provide support for programs written for Posix style systems. In the Plan 9 distribution, the APE sources are found under /sys/src/ape. They are compiled and used with Plan 9's native compiler.
This set of sources is intended to be placed under /sys/src/gnu/ape instead. It has been modified so as to compile under GCC, and to use GCC's calling conventions. This neccessitated some changes to the system call wrappers in particular, along with other minor changes throughout the libraries.
To build, you will need gcc already installed on your Plan 9 system. This is available in binary form in a separate archive. Then, just type "mk install" and the libraries will be compiled and installed under /$objtype/lib/gnu (objtype currently must be 386). A simple "mk clean" afterwards will remove all intermediate files.
TODO: makefiles will be written for simple compilation of the APE libraries on other hosts using a plan9-targeting cross compiler.