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    Sorry, when I sent the first email I had used 'gcc'. I then
    specified $CC, and still got the same error even though it was
    picking the correct one this time (see below).<br>
    <br>
    Cheers,<br>
    <br>
    JC<br>
    <br>
    <address>
----------------------------------------------------------------------------------------------------------------------------------</address>
    <address>/usr/bin/gcc -fno-strict-aliasing -g -O2 -DNDEBUG -g
      -fwrapv -O3 -Wall -Wstrict-prototypes -DECHO -DWCSTRIG_MACRO
      -DASTROPY_WCS_BUILD -D_GNU_SOURCE -DWCSVERSION=4.10 -DNDEBUG
      -UDEBUG
      -I/Users/jcpassy/Work/yt-x86_64/lib/python2.7/site-packages/numpy/core/include
      -Iastropy/wcs/src/wcslib/C -Iastropy/wcs/include
      -I/Users/jcpassy/Work/yt-x86_64/include/python2.7 -c
      astropy/wcs/src/wcslib/C/wcserr.c -o
      build/temp.macosx-10.4-x86_64-2.7/astropy/wcs/src/wcslib/C/wcserr.o</address>
    <address><br>
      astropy/wcs/src/wcslib/C/wcserr.c:160: internal compiler error:
      Segmentation fault: 11</address>
    <address><br>
      Please submit a full bug report,</address>
    <address><br>
      with preprocessed source if appropriate.</address>
    <address><br>
      See <URL:http://developer.apple.com/bugreporter> for
      instructions.</address>
    <address><br>
      error: command '/usr/bin/gcc' failed with exit status 1</address>
    <address><br>
      ----------------------------------------</address>
    <address><br>
      Command /Users/jcpassy/Work/yt-x86_64/bin/python2.7 -c "import
      setuptools;__file__='/Users/jcpassy/Work/build/astropy/setup.py';exec(compile(open(__file__).read().replace('\r\n',
      '\n'), __file__, 'exec'))" install
      --single-version-externally-managed --record
      /var/folders/t8/81q6fg4d1fz49ylm0ycp3k2h0000gp/T/pip-S6j7of-record/install-record.txt
      failed with error code 1 in /Users/jcpassy/Work/build/astropy</address>
    <address><br>
      Exception information:</address>
    <address>Traceback (most recent call last):</address>
    <address>  File
      "/Users/jcpassy/Work/yt-x86_64/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/basecommand.py",
      line 104, in main</address>
    <address>    status = self.run(options, args)</address>
    <address>  File
      "/Users/jcpassy/Work/yt-x86_64/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/commands/install.py",
      line 250, in run</address>
    <address>    requirement_set.install(install_options,
      global_options)</address>
    <address>  File
      "/Users/jcpassy/Work/yt-x86_64/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py",
      line 1133, in install</address>
    <address>    requirement.install(install_options, global_options)</address>
    <address>  File
      "/Users/jcpassy/Work/yt-x86_64/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py",
      line 577, in install</address>
    <address>    cwd=self.source_dir,
      filter_stdout=self._filter_install, show_stdout=False)</address>
    <address>  File
      "/Users/jcpassy/Work/yt-x86_64/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/__init__.py",
      line 256, in call_subprocess</address>
    <address>    % (command_desc, proc.returncode, cwd))</address>
    <address>InstallationError: Command
      /Users/jcpassy/Work/yt-x86_64/bin/python2.7 -c "import
      setuptools;__file__='/Users/jcpassy/Work/build/astropy/setup.py';exec(compile(open(__file__).read().replace('\r\n',
      '\n'), __file__, 'exec'))" install
      --single-version-externally-managed --record
      /var/folders/t8/81q6fg4d1fz49ylm0ycp3k2h0000gp/T/pip-S6j7of-record/install-record.txt
      failed with error code 1 in /Users/jcpassy/Work/build/astropy</address>
    <address>----------------------------------------------------------------------------------------------------------------------------------</address>
    <br>
    <br>
    <div class="moz-cite-prefix">On 6/20/12 12:50 PM, Tim Jenness wrote:<br>
    </div>
    <blockquote
cite="mid:CA+G92Rfpfcy2J4LLcKuyZH4WThqkKcvjDnQ4i4287W+1bwF0AQ@mail.gmail.com"
      type="cite">
      <pre wrap="">On Wed, Jun 20, 2012 at 9:41 AM, Jean-Claude Passy <jcpassy@gmail.com> wrote:

</pre>
      <blockquote type="cite">
        <pre wrap="">----------------------------------------------------------------- [12:36:08]
Astrobook2:$ /usr/bin/gcc --version i686-apple-darwin11-llvm-gcc-4.2 (GCC)
4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
-----------------------------------------------------------------
and

----------------------------------------------------------------- [12:37:14]
Astrobook2:$ which gcc /opt/mesasdk/bin/gcc [12:37:17] Astrobook2:$ gcc
--version gcc (GCC) 4.7.0 20111114 (experimental)
-----------------------------------------------------------------
The gcc 4.7 is part of a package I had to install for another code. This is
why I used $CC to specify which compiler to use.

</pre>
      </blockquote>
      <pre wrap="">
but the compile line says it's using plain "gcc" rather than
"/usr/bin/gcc" so it seems to be picking up your experimental
compiler. If you remove /opt/mesasdk/bin from your path do things
build ok?

</pre>
    </blockquote>
    <br>
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