This patch changes Makefile to use perl for version number replacement to fix
'make install' on Darwin. The problem is that GNU sed and sed on Darwin (and
probably on BSDs) behave differently with regards to the '-i' command line
option.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Heikki Hokkanen <hoxu@users.sf.net>

The manpage is in pod format, and pod2man can be used to convert it.