How to make OmniPascal work with FPC in Visual Studio Code?

I've installed both the FreePascal compiler and OmniPascal extension for Visual Studio Code, but code completion doesn't work.

In the manual, you are saying that I need to write the path to the Delphi compiler in the user settings, but nothing is said about FPC.

• Set the omnipascal.freePascalSourcePath setting to the folder that contains the FreePascal sources
• Set the omnipascal.defaultDevelopmentEnvironment setting to FreePascal
• Restart Visual Studio Code.

Example:

"omnipascal.freePascalSourcePath": "C:\\lazarus\\fpc"
"omnipascal.defaultDevelopmentEnvironment": "FreePascal"

This will instruct the OmniPascal language server to lookup Pascal units (.pas and .pp files) in that directory and all its subtrees recursively.