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I'm trying to install the command line tools on Yosemite but I'm getting the following error:

$ xcode-select --install

dyld: Symbol not found: __cg_png_create_info_struct
  Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /usr/local/lib/libPng.dylib
 in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
Trace/BPT trap: 5

What is causing this error and how do I fix it?

2daaa
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  • Do you have `DYLD_LIBRARY_PATH` environment variable set? – baf Jun 02 '15 at 06:17
  • No, but there is a file at /usr/local/lib/libPng.dylib. – 2daaa Jun 02 '15 at 13:13
  • Your problem is that user installed `libpng` overshadows system one. You could uninstall it, but then some non-system executables may complain. – baf Jun 02 '15 at 13:37
  • I think `matplotlib` is the reason there's a new user installed `libpng`. Is there some way I can check what version of `libpng` I installed and what version is expected by XCode? – 2daaa Jun 02 '15 at 14:35
  • I take that back about `matplotlib`. The version of `libpng` I have was installed through `homebrew`, but I installed `matplotlib` through `pip`. – 2daaa Jun 02 '15 at 15:04
  • Is `/usr/local/lib/libPng.dylib` a symlink or a regular file? – baf Jun 02 '15 at 16:51
  • It's a symlink to the `libPng` in `/usr/local/Cellar` that homebrew installs. – 2daaa Jun 02 '15 at 17:28

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