5 POSIX specification: @url{http://www.opengroup.org/susv3xsh/chown.html}
9 Portability problems fixed by Gnulib:
12 When passed an argument of -1, some implementations really set the owner
13 user/group id of the file to this value, rather than leaving that id of the
16 When applied to a symbolic link, some implementations don't dereference
17 the symlink, i.e.@: they behave like @code{lchown}.
20 Portability problems not fixed by Gnulib:
23 This function is missing on some platforms: