Portability problems fixed by Gnulib:
@itemize
@item
-This function is missing on some platforms:
+Some platforms fail to detect trailing slash on non-directories, as in
+@code{lchown("link-to-file/",uid,gid)}:
+FreeBSD 7.2, Solaris 9.
+@item
+Some platforms fail to update the change time when at least one
+argument was not -1, but no ownership changes resulted. However,
+without @code{lchmod}, the replacement only fixes this for non-symlinks:
+OpenBSD 4.0.
+@item
+This function is missing on some platforms; however, the replacement
+fails on symlinks if @code{chown} is supported, and fails altogether
+with @code{ENOSYS} otherwise:
MacOS X 10.3, mingw, BeOS.
@end itemize