Why Can't Go Find My Package Despite a Correct GOPATH Setting?

Error: "Cannot find package" Despite Proper GOPATH Setting

When attempting to build Go packages using "go build" or "go run," you may encounter an error message "cannot find package" even though GOPATH is correctly set.

Explanation

The issue arises because Go's build system expects packages to reside in directories that match their package names. In the provided example:

foobar.go

...the package name is "foobar." However, the code is located in a directory without that name.

Solution

To resolve the issue, move the source file to a directory that matches the package name:

• Move foobar.go to $GOPATH/src/foobar/foobar.go.

Recommended Additional Steps

For convenience and best practices:

• Ensure your $GOPATH/bin directory is in your $PATH:

PATH="$GOPATH/bin:$PATH"

• Move main.go to a subdirectory of $GOPATH/src, such as $GOPATH/src/test.
• Run go install test to create an executable in $GOPATH/bin that can be invoked directly from the command line.

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