python setup.py develop failing on Mac OSX
I am trying to build a development version of pandas off master, which I have done successfully in the past.  One change is that I did try to build a development version of scipy which is apparently quite difficult (I could not get it to work) and I may have messed up my build system in the process.  I have spent many hours trying to figure it out and I cannot. I don't suspect this is a bug as these errors are not new lines of code but maybe I am wrong.  Any ideas/suggestions?

Current system is Mac OS X 10.8.5 (notice the 10.6 version below but this is carryover from when I upgraded my os).  I tried gcc-4.2, llvm-gcc-4.2, clang and all have similar issues with compiling parser.

```
cythoning pandas/parser.pyx to pandas/parser.c

Error compiling Cython file:
------------------------------------------------------------
...
        self.compact_ints = compact_ints
        self.use_unsigned = use_unsigned

        self.verbose = verbose
        self.low_memory = low_memory
        self.parser.converter = xstrtod
                                      ^
------------------------------------------------------------

pandas/parser.pyx:437:39: Cannot assign type 'double (char const *, char **, char, char, char, int)' to 'double (*)(char const , char **, char, char, char, int)'

Error compiling Cython file:
------------------------------------------------------------
...

        self.verbose = verbose
        self.low_memory = low_memory
        self.parser.converter = xstrtod
        if float_precision == 'high':
            self.parser.converter = precise_xstrtod
                                                  ^
------------------------------------------------------------

pandas/parser.pyx:439:51: Cannot assign type 'double (char const *, char **, char, char, char, int)' to 'double (*)(char const , char **, char, char, char, int)'

Error compiling Cython file:
------------------------------------------------------------
...
        self.low_memory = low_memory
        self.parser.converter = xstrtod
        if float_precision == 'high':
            self.parser.converter = precise_xstrtod
        elif float_precision == 'round_trip':
            self.parser.converter = round_trip
                                             ^
------------------------------------------------------------

pandas/parser.pyx:441:46: Cannot assign type 'double (char const *, char **, char, char, char, int)' to 'double (*)(char const , char **, char, char, char, int)'

Error compiling Cython file:
------------------------------------------------------------
...
            # in the hash table
            if k != na_hashset.n_buckets:
                na_count += 1
                data[0] = NA
            else:
                data[0] = parser.converter(word, &p_end, parser.decimal, parser.sci,
                                              ^
------------------------------------------------------------

pandas/parser.pyx:1496:47: Cannot assign type 'char *' to 'char const '

Error compiling Cython file:
------------------------------------------------------------
...
                        data[0] = NA
            data += 1
    else:
        for i in range(lines):
            word = COLITER_NEXT(it)
            data[0] = parser.converter(word, &p_end, parser.decimal, parser.sci,
                                          ^
------------------------------------------------------------

pandas/parser.pyx:1513:43: Cannot assign type 'char *' to 'char const '
building 'pandas.parser' extension
creating build/temp.macosx-10.6-intel-3.4/pandas/src/parser
gcc-4.2 -fno-strict-aliasing -Werror=declaration-after-statement -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -arch i386 -arch x86_64 -isysroot /Developer/SDKs/MacOSX10.6.sdk -g -Ipandas/src/klib -Ipandas/src -I/Users/temp/Projects/PYTHON3.4/lib/python3.4/site-packages/numpy/core/include -I/Library/Frameworks/Python.framework/Versions/3.4/include/python3.4m -c pandas/parser.c -o build/temp.macosx-10.6-intel-3.4/pandas/parser.o
```

gcc version:

```
gcc-4.2 --version
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
```
