How do I set the $GOPATH environment variable on Mac OSX for Go?

Problem: Setting $GOPATH on Mac OSX

When attempting to set the $GOPATH environment variable on Mac OSX, users may encounter the following error: "cannot find package "github.com/#GITHUB_USERNAME#/smitego" in any of: /usr/local/go/src/pkg/github.com/#GITHUB_USERNAME#/smitego (from $GOROOT) ($GOPATH not set)".

Solution:

Since Go version 1.8 (released in February 2017), the GOPATH is automatically determined by the Go toolchain on Mac OSX. It defaults to $HOME/go, which simplifies the initial setup process.

Manual Method for the Shell:

For earlier versions of Go or for a more manual approach, add the following lines to ~/.bash_profile:

export GOPATH=$HOME/go
export PATH=$GOPATH/bin:$PATH

Configuring Sublime Text:

For Sublime Text, set the GOPATH in the User settings:

{
        "shell": ["/bin/bash"],
        "env": {"GOPATH": "/Users/#USERNAME#/go/"},
}

Important Note:

When setting GOPATH, always remember to specify the path to the root go directory where src, pkg, and bin reside, not the full path to the specific package.

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