El Capitan的八度错误，不是可写错误

Question

I'm trying to install Octave on my El Capitan Macbook but I'm getting an odd error.

OSX-3:~ me$ brew install octave
==> Installing octave from homebrew/science
Error: You must `brew link jpeg libtiff libpng freetype gmp fontconfig gd lua` before homebrew/science/octave can be installed

So I do what it told me to do ...

OSX-3:~ me$ brew link jpeg libtiff libpng freetype gmp fontconfig gd lua
Linking /usr/local/Cellar/jpeg/8d...
Error: Could not symlink include/jconfig.h
/usr/local/include is not writable.

I tried "sudo brew" as well, but that did not work either.

Answer 1

Due to El Capitan update your /usr/local ownership might have been reseted to its default root:wheel and are not writable without sudo privileges.

Brew and sudo doesn't work well together as brew is intended to write in folder owned by a non root user.

To fix this you have to chown /usr/local :

sudo chown -R $(whoami):admin /usr/local

Have a look at this issue on the homebrew's github for more informations.