Version of Freeciv in portage may be updated as more recent are now released by upstream http://www.freeciv.org/wiki/NEWS-2.5.10 http://www.freeciv.org/wiki/NEWS-2.6.0-beta2 I checked 2.5.10 and it compiles/installs with simple version bump.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=646c2153d2ca776aea214b6962b89046078156a7 commit 646c2153d2ca776aea214b6962b89046078156a7 Author: Lars Wendler <polynomial-c@gentoo.org> AuthorDate: 2018-02-04 06:03:18 +0000 Commit: Lars Wendler <polynomial-c@gentoo.org> CommitDate: 2018-02-04 06:03:18 +0000 games-strategy/freeciv: Bump to versions 2.5.10 and 2.6.0_beta2 Removed old. Closes: https://bugs.gentoo.org/646266 Package-Manager: Portage-2.3.24, Repoman-2.3.6 games-strategy/freeciv/Manifest | 3 +- games-strategy/freeciv/freeciv-2.5.10.ebuild | 177 +++++++++++++++++++++ ...6.0_beta1.ebuild => freeciv-2.6.0_beta2.ebuild} | 2 +- 3 files changed, 180 insertions(+), 2 deletions(-)