error: C compiler cannot create executables (GEOS, basemap) - c

Question

I am currently getting the following error when attempting to get basemap-1.0.7 to work on my MAC OS v10.7.3:
error: C compiler cannot create executables
I downloaded basemap-1.0.7.tar.gz from here, and upon installation, I followed the numbered instructions in the README file:
0) Install pre-requisite python modules numpy and matplotlib.
1) Then download basemap-X.Y.Z.tar.gz (approx 100 mb) from
the sourceforge download site, unpack and cd to basemap-X.Y.Z.
2) Install the GEOS library. If you already have it on your
system, just set the environment variable GEOS_DIR to point to the location
of libgeos_c and geos_c.h (if libgeos_c is in /usr/local/lib and
geos_c.h is in /usr/local/include, set GEOS_DIR to /usr/local).
Then go to step (3). If you don't have it, you can build it from
the source code included with basemap by following these steps:
> cd geos-3.3.3
> export GEOS_DIR=<where you want the libs and headers to go>
A reasonable choice on a Unix-like system is /usr/local, or
if you don't have permission to write there, your home directory.
> ./configure --prefix=$GEOS_DIR
> make; make install
0) Done: I use anaconda, so both import numpy and import matplotlib work in an interactive session of ipython.
1) Done: basemap 1.0.7 is downloaded, unpacked, and I have changed my working directory to to Downloads/basemap-1.0.7/
2) Problem: I do not have the GEOS library. Therefore, I followed the instructions as per the README file:
cd geos-3.3.3
export GEOS_DIR=/Users/ged/anaconda/lib/python2.7/site-packages/
./configure --prefix=$GEOS_DIR
The ensuing terminal output is:
checking build system type... i386-apple-darwin11.3.0
checking host system type... i386-apple-darwin11.3.0
checking target system type... i386-apple-darwin11.3.0
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... ./install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... no
checking whether to enable maintainer-specific portions of Makefiles... no
checking for gcc... gcc
checking whether the C compiler works... no
configure: error: in `/Users/ged/Downloads/basemap-1.0.7/geos-3.3.3':
configure: error: C compiler cannot create executables
See `config.log' for more details
The config.log file is a bit long to put it here, so I've made it available here
I have tried installing GEOS through GDAL 1.11, and I also looked into upgrading to xcode 4.6.3 but, to be honest, I feel a little out of my depth.
I'm getting the following message:
error: C compiler cannot create executables
Could you please provide some insight on how to solve this issue?
Thanks in advance!