warnings - Warnings with Homebrew

Question

I did everything from this link http://www.moncefbelyamani.com/how-to-install-xcode-homebrew-git-rvm-ruby-on-mac/#lion-install

But when I do command "brew doctor" I see warnings:

Warning: "config" scripts exist outside your system or Homebrew directories. ./configure scripts often look for *-config scripts to determine if software packages are installed, and what additional flags to use when compiling and linking.

Having additional scripts in your path can confuse software installed via Homebrew if the config script overrides a system or Homebrew provided script of the same name. We found the following "config" scripts:

/usr/local/bin/gpg-error-config
/usr/local/bin/ksba-config
/usr/local/bin/pkg-config

Warning: Your Homebrew is not installed to /usr/local You can install Homebrew anywhere you want, but some brews may only build correctly if you install in /usr/local. Sorry!

I don't know what to do with that. I want to install the calabash-cucumber gem, but when i try to do that, it says that can't find files.