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Sender: Raphael Kubo da Costa <kubito@gmail.com>
From: Raphael Kubo da Costa <rakuco@FreeBSD.org>
To: freebsd-x11@FreeBSD.org
Subject: libXrender 0.9.7_1 fails to build on CURRENT
Date: Thu, 06 Jun 2013 00:42:40 +0300
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This is r250676 with clang on amd64.

checking if cc supports -errwarn=E_NO_EXPLICIT_TYPE_GIVEN -errwarn=E_NO_IMPLICIT_DECL_ALLOWED... eval: ${xorg_cv_cc_flag__errwarn_E_NO_EXPLICIT_TYPE_GIVEN ...}: Bad substitution
===>  Script "configure" failed unexpectedly.

Do you need config.log?