Used by systemd (and compatible) installations for socket
activation. See L<systemd.socket(5)> and L<sd_listen_fds(3)>.
+=item PERL_INLINE_DIRECTORY
+
+Pointing this to point to a writable directory enables the use
+of L<Inline> and L<Inline::C> extensions which may provide
+platform-specific performance improvements. Currently, this
+enables the use of L<vfork(2)> which speeds up subprocess
+spawning with the Linux kernel.
+
+public-inbox will never enable L<Inline::C> automatically without
+this environment variable set. See L<Inline> and L<Inline::C>
+for more details.
+
=back
=head1 UPGRADING
=head1 COPYRIGHT
-Copyright 2013-2016 all contributors L<mailto:meta@public-inbox.org>
+Copyright 2013-2018 all contributors L<mailto:meta@public-inbox.org>
License: AGPL-3.0+ L<https://www.gnu.org/licenses/agpl-3.0.txt>