Upstream introduced parallel build problem on Cygwin:
https://savannah.gnu.org/bugs/index.php?55708
Signed-off-by: Michael Haubenwallner <haubi@gentoo.org>
# Copyright 1999-2019 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
+# Michael Haubenwallner <haubi@gentoo.org> (13 Feb 2019)
+# see upstream report https://savannah.gnu.org/bugs/index.php?55708
+=sys-apps/groff-1.22.4
+
# Michael Haubenwallner <haubi@gentoo.org> (30 Jan 2019)
# Cygwin does not have updated patches yet, is not trivial
>=sys-apps/coreutils-8.30