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