buildbot failure in Python on x86 Gentoo Non-Debug with X 3.x

The Buildbot has detected a new failure on builder x86 Gentoo Non-Debug with X 3.x while building python/cpython. Full details are available at: http://buildbot.python.org/all/builders/x86%20Gentoo%20Non-Debug%20with%20X%...
Buildbot URL: http://buildbot.python.org/all/
Buildslave for this Build: ware-gentoo-x86
Build Reason: The SingleBranchScheduler scheduler named '3.x' triggered this build Build Source Stamp: [branch master] 5659a72f487579be76335c09c8ba8b2f1800adde Blamelist: Victor Stinner <victor.stinner@gmail.com>
BUILD FAILED: failed clean
Sincerely, -The Buildbot

fatal: unable to access 'https://github.com/python/cpython.git/': OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to github.com:443
2017-08-11 1:28 GMT+02:00 <buildbot@python.org>:
The Buildbot has detected a new failure on builder x86 Gentoo Non-Debug with X 3.x while building python/cpython. Full details are available at: http://buildbot.python.org/all/builders/x86%20Gentoo%20Non-Debug%20with%20X%...
Buildbot URL: http://buildbot.python.org/all/
Buildslave for this Build: ware-gentoo-x86
Build Reason: The SingleBranchScheduler scheduler named '3.x' triggered this build Build Source Stamp: [branch master] 5659a72f487579be76335c09c8ba8b2f1800adde Blamelist: Victor Stinner <victor.stinner@gmail.com>
BUILD FAILED: failed clean
Sincerely, -The Buildbot
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Victor Stinner