Please add ~arm64 keyword for net-ftp/pure-ftpd. Compiles and works fine here.
sys-fs/quota is also needed as a depentency with USE="quota" It also just compiles fine after setting keyword.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b21dfc9a72ac2ecf4d50fe3e14d4b5b985fb89c3 commit b21dfc9a72ac2ecf4d50fe3e14d4b5b985fb89c3 Author: Mart Raudsepp <leio@gentoo.org> AuthorDate: 2018-01-05 00:57:37 +0000 Commit: Mart Raudsepp <leio@gentoo.org> CommitDate: 2018-01-05 01:07:17 +0000 net-ftp/pure-ftpd-1.0.47: add ~arm64 keyword Closes: https://bugs.gentoo.org/642652 Package-Manager: Portage-2.3.19, Repoman-2.3.6 net-ftp/pure-ftpd/pure-ftpd-1.0.47.ebuild | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Additionally, it has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=8d9f0da95030d3dd16700cf2c82b4087ffefd30e commit 8d9f0da95030d3dd16700cf2c82b4087ffefd30e Author: Mart Raudsepp <leio@gentoo.org> AuthorDate: 2018-01-05 00:53:09 +0000 Commit: Mart Raudsepp <leio@gentoo.org> CommitDate: 2018-01-05 01:07:09 +0000 sys-fs/quota-4.04-r1: add ~arm64 keyword Bug: https://bugs.gentoo.org/642652 Package-Manager: Portage-2.3.19, Repoman-2.3.6 sys-fs/quota/quota-4.04-r1.ebuild | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)}