Problem installing xcode 4.6.2 on OS X 10.8.5

I came across this issue in another post but not certain if the errors you are getting are the same but here it is. Source is provided below:

Use Pacifist to install MobileDevice.pkg!!! Simply open the file with pacifist click the top right Lock button that says Not Authorized Type your password and hit install once thats done install itunes normally or with pacifist worked great for me

SOURCE: http://www.tonymacx86.com/general-help/98821-xcode-itunes-mobiledevice-pkg-fix.html

Seems that you have problems connecting to github via https.

While I'm not sure what could cause it and how to fix it, you still can use git with another protocol.

Here's the commands to install homebrew in /usr/local/ from scratch using git:// instead of https://:

cd /usr/local/
git init -q
git remote add origin git://github.com/mxcl/homebrew
git fetch origin master:refs/remotes/origin/master -n
git reset --hard origin/master

That should work. Please notice that if you choose to use another directory for homebrew, you probably will have to append its ./bin directory to your environment PATH variable for comfortable usage.