--- /dev/null
+@node unistd.h
+@section @file{unistd.h}
+
+POSIX specification: @url{http://www.opengroup.org/susv3xbd/unistd.h.html}
+
+Gnulib module: unistd
+
+Portability problems fixed by Gnulib:
+@itemize
+@item
+This header file is missing on some platforms: msvc.
+@item
+The SEEK_* macros are not defined in this file on some platforms: mingw.
+@item
+The @code{_exit} function is not declared in this file on some platforms:
+mingw.
+@end itemize
+
+Portability problems not fixed by Gnulib:
+@itemize
+@end itemize