8.80 ucontext.h

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

Gnulib module: —

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

• This header file is missing on some platforms: OpenBSD 3.8, Cygwin, mingw, MSVC 9, BeOS.