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.