How do I install imagemagick with homebrew?

I'm trying to install Imagemagick on OSX Lion but something is not working as expected.

-> brew install imagemagick

/usr/local/git/bin/git
==> Cloning https://github.com/adamv/ImageMagick.git
Cloning into /Users/klebershimabuku/Library/Caches/Homebrew/imagemagick--git...
fatal: https://github.com/adamv/ImageMagick.git/info/refs not found: did you run git      update-server-info on the server?
Error: Failure while executing: git clone --depth 1 https://github.com/adamv/ImageMagick.git /Users/kleber/Library/Caches/Homebrew/imagemagick--git

brew doctor says:

-> brew doctor
We couldn't detect gcc 4.0.x. Some formulae require this compiler.

Some "config" scripts were found in your path, but not in system or Homebrew folders.

`./configure` scripts often look for *-config scripts to determine if software packagesare 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.

/Users/kleber/.rvm/gems/ruby-1.9.2-p180@global/bin
passenger-config

Setting DYLD_LIBARY_PATH can break dynamic linking.
You should probably unset it.

And yes, I have XCode 4.1 installed and running.

-> brew update
From http://github.com/mxcl/homebrew
* branch            master     -> FETCH_HEAD
Already up-to-date.

You could try:

brew update && brew install imagemagick

The quickest fix for me was doing the following:

cd /usr/local
git reset --hard FETCH_HEAD

Then I retried brew install imagemagick and it correctly pulled the package from the new mirror, instead of adamv.

If that does not work, ensure that /Library/Caches/Homebrew does not contain any imagemagick files or folders. Delete them if it does.

brew install imagemagick

Don't forget to install also gs which is a dependency if you want to convert pdf to images for example :

brew install ghostscript