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After installing XQuartz you may add a symlink to your X11 installation folder by just entering
（安装XQuartz，并建立X11到系统库的硬连接）
1 sudo ln -s /opt/X11/include/X11 /usr/local/include/X11 2 sudo ln -s /opt/X11/include/X11 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/usr/include/
（注释：ln 命令 建立硬连接）
解决“Xlib.h not found when building graphviz on Mac OS X 10.8”错误
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原文地址：http://www.cnblogs.com/bindong/p/5789454.html
