用pip安装PIL

我正在尝试使用以下命令安装PIL（Python Imaging Library）：

sudo pip install pil

但我收到以下消息：

Downloading/unpacking PIL

You are installing a potentially insecure and unverifiable file. Future versions of pip will default to disallowing insecure files.

Downloading PIL-1.1.7.tar.gz (506kB): 506kB downloaded

Running setup.py egg_info for package PIL

WARNING: '' not a valid package name; please use only.-separated package names in setup.py

Installing collected packages: PIL

Running setup.py install for PIL

WARNING: '' not a valid package name; please use only.-separated package names in setup.py

--- using frameworks at /System/Library/Frameworks

building '_imaging' 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 -IlibImaging -I/System/Library/Frameworks/Python.framework/Versions/2.7/include -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c _imaging.c -o build/temp.macosx-10.8-intel-2.7/_imaging.o

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__='/private/tmp/pip_build_root/PIL/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-AYrxVD-record/install-record.txt --single-version-externally-managed:

WARNING: '' not a valid package name; please use only.-separated package names in setup.py

running install

running build

copying PIL/XVThumbImagePlugin.py -> build/lib.macosx-10.8-intel-2.7

running build_ext

--- using frameworks at /System/Library/Frameworks

building '_imaging' extension

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

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

您能帮我安装PIL吗？

慕侠2389804