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我不能让BREW链接pygame，当我试图安装pygame我得到一个权限错误BREW链接SDL无法联系提供权限被拒绝的错误
$ brew install pygame
==> Installing pygame from homebrew/homebrew-python
Error: You must `brew link sdl' before pygame can be installed
$ brew link sdl
Linking /usr/local/Cellar/sdl/1.2.15...
Error: Could not symlink share/man/man3/SDLKey.3
/usr/local/share/man/man3 is not writable.
从这个错误消息，目前尚不清楚我应该符号链接？