Comment 7 for bug 941039

Ok, so I did a clean wipe. Xcode 4.2, fresh macports, and the latest dorsal pull. cpp demos are fine, python demos still fail with

 python demo_poisson.py <178>
Calling FFC just-in-time (JIT) compiler, this may take some time.
Calling DOLFIN just-in-time (JIT) compiler, this may take some time.
In instant.recompile: The module did not compile, see '/Users/lukeo/.instant/error/dolfin_compile_code_e1943bf019544ac3d18ab9b095c465ab/compile.log'
Traceback (most recent call last):
  File "demo_poisson.py", line 54, in <module>
    f = Expression("10*exp(-(pow(x[0] - 0.5, 2) + pow(x[1] - 0.5, 2)) / 0.02)")
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/dolfin/functions/expression.py", line 478, in __new__
    cpp_base, members = compile_expressions([cppcode])
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/dolfin/compilemodules/expressions.py", line 188, in compile_expressions
    code_snippets), classnames)
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/dolfin/compilemodules/expressions.py", line 126, in compile_expression_code
    dolfin_module_import=["function", "mesh", "common"])
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/dolfin/compilemodules/jit.py", line 66, in mpi_jit
    return local_jit(*args, **kwargs)
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/dolfin/compilemodules/compilemodule.py", line 474, in compile_extension_module
    **instant_kwargs)
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/instant/build.py", line 492, in build_module
    recompile(modulename, module_path, setup_name, new_compilation_checksum)
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/instant/build.py", line 115, in recompile
    "compile, see '%s'" % compile_log_filename_dest)
  File "/Users/lukeo/Work/FEniCS/lib/python2.7/site-packages/instant/output.py", line 49, in instant_error
    raise RuntimeError(text)
RuntimeError: In instant.recompile: The module did not compile, see '/Users/lukeo/.instant/error/dolfin_compile_code_e1943bf019544ac3d18ab9b095c465ab/compile.log'

The compile.log file is posted above. Again, it seems that it's boost...