--- hints/bsdsunix.pl.orig	2017-03-10 02:22:56 UTC
+++ hints/bsdsunix.pl
@@ -0,0 +1,11 @@
+require Config;
+my($maj) = $Config::Config{osvers} =~ m{^(\d+)};
+if ($maj < 5) {
+    print STDERR "Using procfs implementation\n";
+    symlink "os/BSDSUniX.c", "OS.c" || die "Could not link os/BSDSUniX.c to os/OS.c\n";
+} else {
+    print STDERR "Using kvm implementation\n";
+    symlink "os/BSDSUniX-kvm.c", "OS.c" || die "Could not link os/BSDSUniX-kvm.c to os/OS.c\n";
+    $self->{LIBS} = ['-lkvm'];
+}
+