Golang 1.5 setup in Mac OSX with HomeBrew. Set `GOPATH` and `GOROOT` variables in zshell or bash.

.bashrc

# Set variables in .bashrc file

# don't forget to change your path correctly!

export GOPATH=$HOME/golang
export GOROOT=/usr/local/opt/go/libexec
export PATH=$PATH:$GOPATH/bin
export PATH=$PATH:$GOROOT/bin

.zshrc

# Set variables in .zshrc file

# don't forget to change your path correctly!

export GOPATH=$HOME/golang
export GOROOT=/usr/local/opt/go/libexec
export PATH=$PATH:$GOPATH/bin
export PATH=$PATH:$GOROOT/bin

install.sh

echo "Please enter your golang path (ex: $HOME/golang) :"
read gopath

echo "Please enter your github username (ex: vsouza) :"
read user


mkdir $gopath
mkdir -p $gopath/src/github.com/$user

export GOPATH=$gopath
export GOROOT=/usr/local/opt/go/libexec
export PATH=$PATH:$GOPATH/bin
export PATH=$PATH:$GOROOT/bin

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew update
brew install go
brew install git
brew install mercurial

go get golang.org/x/tools/cmd/godoc
go get golang.org/x/tools/cmd/vet

echo "go to https://golang.org/doc/code.html and enjoy :D"