unistd.h
========

POSIX specification: http://www.opengroup.org/susv3xbd/unistd.h.html

Gnulib module: unistd

Portability problems fixed by Gnulib:

  * This header file is missing on some platforms: msvc.

  * The SEEK_* macros are not defined in this file on some platforms: mingw.

  * The _exit function is not declared in this file on some platforms: mingw.

Portability problems not fixed by Gnulib: