The project seems to have moved to github. => https://github.com/jemalloc/jemalloc Downloading manually from https://github.com/jemalloc/jemalloc/archive/3.6.0.tar.gz works as expected.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b8ff0a82be01d1688802ffe5977cae76988e9207 commit b8ff0a82be01d1688802ffe5977cae76988e9207 Author: Michael Mair-Keimberger <m.mairkeimberger@gmail.com> AuthorDate: 2018-03-17 20:06:01 +0000 Commit: Lars Wendler <polynomial-c@gentoo.org> CommitDate: 2018-04-09 14:23:40 +0000 dev-libs/jemalloc: fix HOMEPAGE, use github SRC_URI Closes: https://bugs.gentoo.org/646046 dev-libs/jemalloc/jemalloc-3.6.0.ebuild | 6 +++--- dev-libs/jemalloc/jemalloc-4.4.0.ebuild | 4 ++-- dev-libs/jemalloc/jemalloc-4.5.0.ebuild | 4 ++-- dev-libs/jemalloc/jemalloc-5.0.1.ebuild | 4 ++-- 4 files changed, 9 insertions(+), 9 deletions(-)