Lua错误加载模块"libpng"（Torch，MacOSX）

如何在 Lua 中使 libpng 正确加载？我正在 Mac OSX 10.10.3 中的 iTorch Notebook 中运行 Lua/Torch，在那里 Lua 中的其他基本函数正常工作，例如绘图和计算。

brew install libpng

警告：libpng-1.6.17 已被安装

如果我运行：

require 'nn';
require 'image';
itorch.image(image.lena())

error loading module 'libpng' from file '/usr/local/lib/lua/5.1/libpng.so': dlopen(/usr/local/lib/lua/5.1/libpng.so, 6): Library not loaded: /usr/local/lib/libpng15.15.dylib Referenced from: /usr/local/lib/lua/5.1/libpng.so Reason: Incompatible library version: libpng.so requires version 33.0.0 or later, but libpng15.15.dylib provides version 29.0.0 warning: could not be loaded (is it installed?) /usr/local/share/lua/5.1/dok/inline.lua:736: libpng package not found, please install libpng stack traceback: [C]: in function 'error' /usr/local/share/lua/5.1/dok/inline.lua:736: in function 'error' /usr/local/share/lua/5.1/image/init.lua:142: in function 'saver' /usr/local/share/lua/5.1/image/init.lua:355: in function 'save' /Users/MY/torch/install/share/lua/5.1/itorch/gfx.lua:25: in function 'f' [string "local f = function() return itorch.image(iii)..."]:1: in main chunk [C]: in function 'xpcall' /Users/MY/torch/install/share/lua/5.1/itorch/main.lua:177: in function /Users/MY/torch/install/share/lua/5.1/lzmq/poller.lua:75: in function 'poll' /Users/MY/torch/install/share/lua/5.1/lzmq/impl/loop.lua:307: in function 'poll' /Users/MY/torch/install/share/lua/5.1/lzmq/impl/loop.lua:325: in function 'sleep_ex' /Users/MY/torch/install/share/lua/5.1/lzmq/impl/loop.lua:370: in function 'start' /Users/MY/torch/install/share/lua/5.1/itorch/main.lua:344: in main chunk [C]: in function 'require' [string "arg={'/Users/MY/.ipython/profile_default/secu..."]:1: in main chunk