Biopython error in mac os x

Hi,

I am new with mac osx and rosetta. I have rosetta 3.3 installed and have trouble with installation of biopython 1.59. on my mac os 10.7, have already installed Xcode 4.3.2. I have pasted the error message. Any help would be highly appreciated.
Thanks

$cd biopython-1.59
$sudo python setup.py install
running install
running build
running build_py
creating build
creating build/lib.macosx-10.7-intel-2.7
creating build/lib.macosx-10.7-intel-2.7/Bio
copying Bio/__init__.py -> build/lib.macosx-10.7-intel-2.7/Bio
copying Bio/_py3k.py -> build/lib.macosx-10.7-intel-2.7/Bio
.
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copying Bio/PopGen/SimCoal/data/ssm_2d.par -> build/lib.macosx-10.7-intel-2.7/Bio/PopGen/SimCoal/data
running build_ext
building ‘Bio.cpairwise2’ extension
creating build/temp.macosx-10.7-intel-2.7
creating build/temp.macosx-10.7-intel-2.7/Bio
llvm-gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -IBio -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c Bio/cpairwise2module.c -o build/temp.macosx-10.7-intel-2.7/Bio/cpairwise2module.o
unable to execute llvm-gcc-4.2: No such file or directory
error: command ‘llvm-gcc-4.2’ failed with exit status 1