Mesa-9: configure: error: C compiler cannot create executables

Greetings,
 A recent install of RELENG_9, followed by a build|install world|kernel.
Returns the following error when attempting an make install of
x11/xorg-minimal

===>  Configuring for dri-9.1.7_5,2
configure: loading site script /usr/ports/Templates/config.site
checking build system type... amd64-portbld-freebsd9.3
checking host system type... amd64-portbld-freebsd9.3
checking target system type... amd64-portbld-freebsd9.3
checking for a BSD-compatible install... /usr/bin/install -c -o root -g wheel
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... (cached) /bin/mkdir -p
checking for gawk... (cached) /usr/bin/awk
checking whether gmake sets $(MAKE)... yes
checking whether gmake supports nested variables... yes
checking for style of include used by gmake... GNU
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in `/usr/ports/graphics/dri/work/Mesa-9.1.7':
configure: error: C compiler cannot create executables
See `config.log' for more details
===>  Script "configure" failed unexpectedly.
Please report the problem to x11_at_FreeBSD.org [maintainer] and attach the
"/usr/ports/graphics/dri/work/Mesa-9.1.7/config.log" including the output of
the failure of your make command. Also, it might be a good idea to provide
an overview of all packages installed on your system (e.g. a
/usr/local/sbin/pkg-static info -g -Ea).
*** [do-configure] Error code 1

Any thoughts on how to overcome this issue?

Relevant info:

# svn info /usr/src

Path: /usr/src
Working Copy Root Path: /usr/src
URL: svn://svn.freebsd.org/base/stable/9
Relative URL: ^/stable/9
Repository Root: svn://svn.freebsd.org/base
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 272203
Node Kind: directory
Schedule: normal
Last Changed Author: thomas
Last Changed Rev: 272184
Last Changed Date: 2014-09-26 12:13:13 -0700 (Fri, 26 Sep 2014)

svn info /usr/ports
Path: /usr/ports
Working Copy Root Path: /usr/ports
URL: svn://svn.freebsd.org/ports/head
Relative URL: ^/head
Repository Root: svn://svn.freebsd.org/ports
Repository UUID: 35697150-7ecd-e111-bb59-0022644237b5
Revision: 369380
Node Kind: directory
Schedule: normal
Last Changed Author: mva
Last Changed Rev: 369380
Last Changed Date: 2014-09-27 01:34:11 -0700 (Sat, 27 Sep 2014)

FreeBSD demon 9.3-STABLE FreeBSD 9.3-STABLE #0 r272203: Sat Sep 27 15:49:55 PDT 2014    
root_at_demon:/usr/obj/usr/src/sys/DEMON  amd64

Thank you for all your time, and consideration.

--Chris