Setting up Go on OS X involves several steps.

Install Go using Homebrew

~# brew update
~# brew install go

 

Install Eclipse. I prefer Eclipse for Java Developers.

Install GoClipse from the update site:

http://goclipse.googlecode.com/svn/trunk/goclipse-update-site
 

1. Install gdb:
   1. Download gdb source file: http://www.gnu.org/software/gdb/download/
   2. Uncompress.

   3. In Terminal;
      ~# cd ~/Downloads/gdb-x.x
      ~# ./configure
      ~# make
      ~# sudo make install
      ~# gdb --version (check version)
      ~# which gdb (check where it is installed)

2. Create a go directory to house your personal go binary installs and sources for bash support. In a Terminal:
   
   ~# mkdir go
   ~# cd go

3. Update ~/.profile:

   export GOPATH=/Users/rmunn/go
   export GOBIN=$GOPATH/bin
   export PATH=/usr/local/bin:$PATH:/usr/local/Cellar/go/1.2.1/libexec/bin

4. Install gocode:
   
   ~# go get github.com/nsf/gocode
    

5. Install Mercurial if you don't have it:
   
   ~# brew install hg
    
6. Install godoc and govet:
   
   ~#  go get code.google.com/p/go.tools/cmd/godoc
   ~# go get code.google.com/p/go.tools/cmd/vet
    
7. Configure the Go Preferences in Eclipse

If you run into problems along the way, most likely $GOPATH or $GOBIN are not set correctly, or the proper tools are not installed (e.g. Mercurial). Check the Web for solutions to particular errors.