I have been struggling with this for a few hours. I am on a Mac using Yosemite. I had homebrew installed, and was using git just fine. I tried doing $git add -i and I got this error:
Can't locate Git.pm in @INC (@INC contains:
So I followed the instructions here: Can't locate Git.pm in @INC
$brew uninstall git worked fine, but after I tried to $brew install git I've been stuck in a terrible cycle.
% brew install git
Error: git-git already installed
To install this version, first `brew unlink git'
% brew unlink git
Error: No such keg: /usr/local/Cellar/git
% brew link git
Error: No such keg: /usr/local/Cellar/git
% git --version
git version 1.9.3 (Apple Git-50)
% brew upgrade git
==> Upgrading 1 outdated package, with result:
git 2.2.2
Error: /usr/local/Library/LinkedKegs/git is not a valid keg
% brew install git
Error: git-git already installed
To install this version, first `brew unlink git'
%
I just want to get homebrew & git back to normal and linked to the correct repo again. I'm really rough around the edges at this stuff, so any help would be greatly appreciated!
Had a similar issue while installing "Lua" in OS X using homebrew. I guess it could be useful for other users facing similar issue in homebrew.
On running the command:
$ brew install lua
The command returned an error:
Error: /usr/local/opt/lua is not a valid keg
(in general the error can be of /usr/local/opt/ is not a valid keg
FIXED it by deleting the file/directory it is referring to, i.e., deleting the "/usr/local/opt/lua" file.
root-user # rm -rf /usr/local/opt/lua
And then running the brew install command returned success.
Os X Mojave 10.14 has:
Error: The Command Line Tools header package must be installed on Mojave.
Solution. Go to
/Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg
location and install the package manually. And brew will start working and we can run:
brew uninstall --force git
brew cleanup --force -s git
brew prune
brew install git
Source: Stackoverflow.com