Why Can't My Go Compiler Find My External Packages?

Using Non-GOROOT Go Packages

Question: Encountering the error "package package1 is not in GOROOT (/usr/local/go/src/package1)" when trying to use an external package in Go.

Explanation: This error occurs when the Go compiler cannot find the specified package in the standard library GOROOT directory. It suggests that the package is not installed or is located outside the standard library.

Solution:

1. Configure Environment Variables:

   • Ensure that the GO111MODULE environment variable is set to "on" to enable module support.
   • Set the GOPATH environment variable to a directory outside of GOROOT.
   • Add both GOPATH/bin and GOROOT/bin to the PATH environment variable.

   For example, you can add these lines to your .bashrc file:

   export GO111MODULE=on
   export GOPATH=/mnt/sda1/programming/gopath
   export PATH=$PATH:$GOPATH/bin
   
   export GOROOT=/usr/local/go
   export PATH=$PATH:$GOROOT/bin

2. Load the Environment Variables:

   • Reload the environment variables by running source ~/.bashrc.

3. Initialize Main Package:

   • Create a new directory for the main project and initialize a module with go mod init main.

4. Create External Package:

   • Create a separate directory for the external package.
   • Within the external package directory, create any necessary files with the package package1 statement in the first line.

5. Import External Package:

   • In the main Go file (main.go), import the external package using its path relative to the main package directory. For example:

   import "main/package1"

By following these steps, you can ensure that your Go compiler can locate and use the external package, resolving the "package package1 is not in GOROOT" error.

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