opnsense-ports/devel/arduino-builder/files/arduino-builder.options.in

{
  "hardwareFolders": "%%PREFIX%%/arduino/hardware",
  "otherLibrariesFolders": "%%PREFIX%%/arduino/libraries",
  "toolsFolders": "%%PREFIX%%/arduino/tools-builder",
  "runtime.ide.version": "%%IDEVER%%"
}