From mboxrd@z Thu Jan  1 00:00:00 1970
From: Junio C Hamano <gitster@pobox.com>
Subject: Porting to a new platform
Date: Fri, 10 Aug 2012 09:20:45 -0700
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To: "Joachim Schmitz" <jojo@schmitz-digital.de>
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"Joachim Schmitz" <jojo@schmitz-digital.de> writes:

> - HP NonStop is lacking poll(),...
> - HP NonStop is lacking getrlimit(), fsync(), setitimer()...

I would check compat/win32 and friends and see what other platforms
that lack this and that do, if I were you.

> so telling configure to search for c99  should help here.

In general, the top-level Makefile is designed to be usable without
ever worrying about "configure" mess.  Just define CC for the
platform section there, and optionally add a support to flip the
same in configure.ac.  This applies equally to other conditional
compilation options you may have to add to support your platform.