Why Can't Go Find My Packages, Even With $GOPATH Set?

Troubleshooting "Cannot find package" Errors in Go Build

Issue:

Despite correctly setting $GOPATH, "go build" and "go run" fail to recognize custom packages.

Cause:

The issue arises when the source file for the custom package is not located in a directory with the same name as the package itself. "go build" and "go install" prioritize matching directories over source files.

Solution:

1. **Ensure valid $GOPATH:** Set $GOPATH to a valid directory, such as "export GOPATH=$HOME/go".
2. Relocate source file: Move the custom source file (e.g., foobar.go) to $GOPATH/src/foobar/foobar.go.

Recommended Additional Steps:

3. Add $GOPATH/bin to $PATH: Append $GOPATH/bin to your $PATH by adding the following line: PATH="$GOPATH/bin:$PATH"
4. Move main.go to a subfolder: Place main.go in a subfolder of $GOPATH/src, such as $GOPATH/src/test.
5. Use go install: Execute "go install test" to generate an executable in $GOPATH/bin. Calling test from the terminal will now run the executable.

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