Mac. 文件夹赋予权限

1. 1. click on your background to go to finder
2. click on go and go to folder /usr
3. right click on local and do get info
4. unlock the lock at the bottom
5. click + sign and add your user to the list and give read/write privileges
6. click on the gear sign at the bottom and choose apply to enclosed items to recurse under that directory and assign privileges too all directories beneath it.

Mac. 文件夹赋予权限

原文：http://www.cnblogs.com/xqnq2007/p/6607538.html