Xblock install on OSX 10.8.2 using Python 2.7.2

Samuels-MacBook-Pro:Github sam$ sudo pip install -r requirements.txt
Password:
Could not open requirements file: [Errno 2] No such file or directory: 'requirements.txt'
Storing complete log in /Users/sam/Library/Logs/pip.log
Samuels-MacBook-Pro:Github sam$ cd XBlock/
Samuels-MacBook-Pro:XBlock sam$ sudo pip install -r requirements.txt
Obtaining file:///Users/sam/Documents/Github/XBlock (from -r requirements.txt (line 19))
  Running setup.py egg_info for package from file:///Users/sam/Documents/Github/XBlock
    
Obtaining file:///Users/sam/Documents/Github/XBlock/workbench (from -r requirements.txt (line 20))
  Running setup.py egg_info for package from file:///Users/sam/Documents/Github/XBlock/workbench
    
Obtaining file:///Users/sam/Documents/Github/XBlock/thumbs (from -r requirements.txt (line 21))
  Running setup.py egg_info for package from file:///Users/sam/Documents/Github/XBlock/thumbs
    
Downloading/unpacking Django>=1.4,<1.5 (from -r requirements.txt (line 2))
  Downloading Django-1.4.5.tar.gz (7.7MB): 7.7MB downloaded
  Running setup.py egg_info for package Django
    
Downloading/unpacking lxml (from -r requirements.txt (line 3))
  Downloading lxml-3.1.0.tar.gz (3.3MB): 3.3MB downloaded
  Running setup.py egg_info for package lxml
    Building lxml version 3.1.0.
    Building without Cython.
    Using build configuration of libxslt 1.1.26
    
    warning: no previously-included files found matching '*.py'
    warning: no files found matching '*.txt' under directory 'src/lxml/tests'
Downloading/unpacking requests (from -r requirements.txt (line 4))
  Downloading requests-1.1.0.tar.gz (337kB): 337kB downloaded
  Running setup.py egg_info for package requests
    
Downloading/unpacking webob (from -r requirements.txt (line 5))
  Downloading WebOb-1.2.3.tar.gz (191kB): 191kB downloaded
  Running setup.py egg_info for package webob
    
    no previously-included directories found matching '*.pyc'
    no previously-included directories found matching '*.pyo'
Downloading/unpacking WSGIProxy (from -r requirements.txt (line 6))
  Downloading WSGIProxy-0.2.2.tar.gz
  Running setup.py egg_info for package WSGIProxy
    
Downloading/unpacking mock (from -r requirements.txt (line 9))
  Downloading mock-1.0.1.tar.gz (818kB): 818kB downloaded
  Running setup.py egg_info for package mock
    
    warning: no files found matching '*.png' under directory 'docs'
    warning: no files found matching '*.css' under directory 'docs'
    warning: no files found matching '*.html' under directory 'docs'
    warning: no files found matching '*.js' under directory 'docs'
Requirement already satisfied (use --upgrade to upgrade): nose in /Library/Python/2.7/site-packages (from -r requirements.txt (line 10))
Downloading/unpacking django-nose (from -r requirements.txt (line 11))
  Downloading django-nose-1.1.tar.gz
  Running setup.py egg_info for package django-nose
    
    warning: no previously-included files matching '*.py[co]' found under directory 'django_nose'
    warning: no previously-included files matching '*.py[co]' found under directory 'testapp'
Downloading/unpacking coverage (from -r requirements.txt (line 12))
  Downloading coverage-3.6.tar.gz (232kB): 232kB downloaded
  Running setup.py egg_info for package coverage
    
    warning: no previously-included files matching '*.pyc' found anywhere in distribution
Downloading/unpacking pylint (from -r requirements.txt (line 13))
  Downloading pylint-0.27.0.tar.gz (224kB): 224kB downloaded
  Running setup.py egg_info for package pylint
    
Downloading/unpacking sphinx (from -r requirements.txt (line 16))
  Downloading Sphinx-1.1.3.tar.gz (2.6MB): 2.6MB downloaded
  Running setup.py egg_info for package sphinx
    /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'use_2to3'
    /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'use_2to3_fixers'
    
    no previously-included directories found matching 'doc/_build'
Downloading/unpacking Paste (from WSGIProxy->-r requirements.txt (line 6))
  Downloading Paste-1.7.5.1.tar.gz (523kB): 523kB downloaded
  Running setup.py egg_info for package Paste
    
    warning: no previously-included files matching '*' found under directory 'docs/_build/_sources'
Downloading/unpacking logilab-common>=0.53.0 (from pylint->-r requirements.txt (line 13))
  Downloading logilab-common-0.59.0.tar.gz (197kB): 197kB downloaded
  Running setup.py egg_info for package logilab-common
    
    package init file './test/__init__.py' not found (or not a regular file)
Downloading/unpacking logilab-astng>=0.21.1 (from pylint->-r requirements.txt (line 13))
  Downloading logilab-astng-0.24.2.tar.gz (104kB): 104kB downloaded
  Running setup.py egg_info for package logilab-astng
    
    package init file './test/__init__.py' not found (or not a regular file)
Downloading/unpacking Pygments>=1.2 (from sphinx->-r requirements.txt (line 16))
  Downloading Pygments-1.6.tar.gz (1.4MB): 1.4MB downloaded
  Running setup.py egg_info for package Pygments
    
Downloading/unpacking Jinja2>=2.3 (from sphinx->-r requirements.txt (line 16))
  Downloading Jinja2-2.6.tar.gz (389kB): 389kB downloaded
  Running setup.py egg_info for package Jinja2
    
    warning: no previously-included files matching '*' found under directory 'docs/_build'
    warning: no previously-included files matching '*.pyc' found under directory 'jinja2'
    warning: no previously-included files matching '*.pyc' found under directory 'docs'
    warning: no previously-included files matching '*.pyo' found under directory 'jinja2'
    warning: no previously-included files matching '*.pyo' found under directory 'docs'
Downloading/unpacking docutils>=0.7 (from sphinx->-r requirements.txt (line 16))
  Downloading docutils-0.10.tar.gz (1.6MB): 1.6MB downloaded
  Running setup.py egg_info for package docutils
    
    warning: no files found matching 'MANIFEST'
    warning: no files found matching '*' under directory 'extras'
    warning: no previously-included files matching '.cvsignore' found under directory '*'
    warning: no previously-included files matching '*.pyc' found under directory '*'
    warning: no previously-included files matching '*~' found under directory '*'
    warning: no previously-included files matching '.DS_Store' found under directory '*'
Installing collected packages: Django, lxml, requests, webob, WSGIProxy, mock, django-nose, coverage, pylint, sphinx, XBlock, XBlockWorkbench, thumbs-xblock, Paste, logilab-common, logilab-astng, Pygments, Jinja2, docutils
  Running setup.py install for Django
    changing mode of build/scripts-2.7/django-admin.py from 644 to 755
    
    changing mode of /usr/local/bin/django-admin.py to 755
  Running setup.py install for lxml
    Building lxml version 3.1.0.
    Building without Cython.
    Using build configuration of libxslt 1.1.26
    building 'lxml.etree' extension
    clang -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 -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -I/usr/include/libxml2 -I/private/tmp/pip-build/lxml/src/lxml/includes -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.macosx-10.8-intel-2.7/src/lxml/lxml.etree.o -flat_namespace
    unable to execute clang: No such file or directory
    error: command 'clang' failed with exit status 1
    Complete output from command /usr/bin/python -c "import setuptools;__file__='/tmp/pip-build/lxml/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-p2dbk_-record/install-record.txt --single-version-externally-managed:
    Building lxml version 3.1.0.

Building without Cython.

Using build configuration of libxslt 1.1.26

running install

running build

running build_py

creating build

creating build/lib.macosx-10.8-intel-2.7

creating build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/__init__.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/_elementpath.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/builder.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/cssselect.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/doctestcompare.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/ElementInclude.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/pyclasslookup.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/sax.py -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/usedoctest.py -> build/lib.macosx-10.8-intel-2.7/lxml

creating build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/__init__.py -> build/lib.macosx-10.8-intel-2.7/lxml/includes

creating build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/__init__.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/_diffcommand.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/_html5builder.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/_setmixin.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/builder.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/clean.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/defs.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/diff.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/ElementSoup.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/formfill.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/html5parser.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/soupparser.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

copying src/lxml/html/usedoctest.py -> build/lib.macosx-10.8-intel-2.7/lxml/html

creating build/lib.macosx-10.8-intel-2.7/lxml/isoschematron

copying src/lxml/isoschematron/__init__.py -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron

copying src/lxml/lxml.etree.h -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/lxml.etree_api.h -> build/lib.macosx-10.8-intel-2.7/lxml

copying src/lxml/includes/c14n.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/config.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/dtdvalid.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/etreepublic.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/htmlparser.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/relaxng.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/schematron.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/tree.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/uri.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/xinclude.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/xmlerror.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/xmlparser.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/xmlschema.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/xpath.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/xslt.pxd -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/etree_defs.h -> build/lib.macosx-10.8-intel-2.7/lxml/includes

copying src/lxml/includes/lxml-version.h -> build/lib.macosx-10.8-intel-2.7/lxml/includes

creating build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources

creating build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/rng

copying src/lxml/isoschematron/resources/rng/iso-schematron.rng -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/rng

creating build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl

copying src/lxml/isoschematron/resources/xsl/RNG2Schtrn.xsl -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl

copying src/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl

creating build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1

copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_abstract_expand.xsl -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1

copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_dsdl_include.xsl -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1

copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_message.xsl -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1

copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_skeleton_for_xslt1.xsl -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1

copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_svrl_for_xslt1.xsl -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1

copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt -> build/lib.macosx-10.8-intel-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1

running build_ext

building 'lxml.etree' extension

creating build/temp.macosx-10.8-intel-2.7

creating build/temp.macosx-10.8-intel-2.7/src

creating build/temp.macosx-10.8-intel-2.7/src/lxml

clang -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 -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch x86_64 -pipe -I/usr/include/libxml2 -I/private/tmp/pip-build/lxml/src/lxml/includes -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.macosx-10.8-intel-2.7/src/lxml/lxml.etree.o -flat_namespace

unable to execute clang: No such file or directory

error: command 'clang' failed with exit status 1

----------------------------------------
Command /usr/bin/python -c "import setuptools;__file__='/tmp/pip-build/lxml/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-p2dbk_-record/install-record.txt --single-version-externally-managed failed with error code 1 in /tmp/pip-build/lxml
Storing complete log in /Users/sam/Library/Logs/pip.log