本文介绍了一种解决在使用Homebrew安装libpng时遇到的链接错误的方法。通过修改目标文件夹权限并强制链接，成功解决了png.h文件存在的冲突。
问题：
➜ ~ brew link libpng
Linking /usr/local/Cellar/libpng/1.6.17...
Error: Could not symlink include/libpng16/png.h
Target /usr/local/include/libpng16/png.h
already exists. You may want to remove it:
rm '/usr/local/include/libpng16/png.h'
To force the link and overwrite all conflicting files:
brew link --overwrite libpng
To list all files that would be deleted:
brew link --overwrite --dry-run libpng解决办法：
sudo chmod -R 777 /usr/local/include/libpng16
brew link --overwrite libpng
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