--- EV/Makefile.PL	2015/06/20 11:11:01	1.57
+++ EV/Makefile.PL	2019/06/22 15:50:36	1.58
@@ -145,6 +145,28 @@
 *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
 
 
+Linux 4.18 introduced another event polling interface, this time using
+the Linux AIO API. While this API is far superior to epoll and almost
+rivals kqueue, it also suffers from the same issues as kqueue typically
+does: only a subset of file types are supported (as of 4.19, I have seen
+eventfd, pipes, sockets files and some devices, but no ttys). It also
+is subject arbitrary system-wide limits imposed on it. Therefore, this
+backend is not used by default, even when it is compiled in, and you have
+to request it explicitly, e.g. with LIBEV_FLAGS=64. If unsure, accept the
+default.
+
+EOF
+
+my $can_linuxaio = have_inc "linux/aio_abi.h";
+$can_linuxaio or die;
+$can_linuxaio = $ENV{EV_LINUXAIO} if exists $ENV{EV_LINUXAIO};
+$DEFINE .= " -DEV_USE_LINUXAIO=" . (0 + (prompt ("Enable linux aio backend (y/n)?", $can_linuxaio ? "y" : "n") =~ /[yY]/));
+
+print <<EOF;
+
+*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
+
+
 Similarly to the epoll backend above, EV can take advantage of kqueue on
 many BSD systems. Support for kqueue will be detected at runtime, with a
 safe fallback to other methods when it cannot be used.