OS Mountain Lion 10.8.2 安装 Cython
使用Python开发的程序，运行速度上不太满意，碰巧看到赖勇浩CSDN博客中翻译的Cython三分钟入门。得空便开始着手尝试，半天未果。
问题一大堆，比如：
OS下终端里设置临时环境变量的方法比较容易：
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export PATH=$PATH:'app/bin'
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OS设置永久环境变量，网上搜了一篇，没太搞明白，但起作用了：Mac下设置环境变量
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编译Clang需要GCC，GCC我在XCode安装目录下找到了：
/Applications/Xcode.app/Contents/Developer/usr/bin
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按照《结构化编译器前端Clang介绍》折腾半天，最终也没能编译成功。
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回头再去XCode安装目录：
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Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
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找到了，果断复制了Clang至：
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/Applications/Xcode.app/Contents/Developer/usr/bin
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也不知道，合不合适，但终端里输入Clang终于有反应了
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cd?Cython-0.17.3
python setup.py build
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阻力继续：
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running build_pyrunning build_extbuilding 'Cython.Plex.Scanners' extensionclang -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/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c Cython/Plex/Scanners.c -o build/temp.macosx-10.8-intel-2.7/Cython/Plex/Scanners.oclang: warning: argument unused during compilation: '-mno-fused-madd'Cython/Plex/Scanners.c:4:10: fatal error: 'Python.h' file not found#include "Python.h" ^1 error generated.error: command 'clang' failed with exit status 1?
stackoverflow上有个最佳答案：
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"Before installing, note that from within Terminal you can use the XCRUN tool to launch compilers and other tools embedded within the Xcode application. Use the XCODE-SELECT tool to define which version of Xcode is active.? Type "man xcrun" from within Terminal to find out more.
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Downloading this package will install copies of the core command line tools and system headers into system folders, including the LLVM compiler, linker, and build tools."
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再次打开终端：输入gcc，输入clang，就这么简单，绕这么大弯。
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python setup.py build 有些警告
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sudo python setup.py install?
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结束！
