New Eclipse workspace, import Built-In-DS project.

Get the following warnings:

Code:
Description                                                                Resource    Path        Location    Type
Unknown referenced nature: com.google.gdt.eclipse.core.webAppNature.    .project    /builtinds    Unknown        Unknown nature
Unknown referenced nature: com.google.gwt.eclipse.core.gwtNature.        .project    /builtinds    Unknown        Unknown nature
---------------------------------
Eclipse IDE for Java v2019-06 (4.12.0) / jre1.8.0_171
Project Target JDK 1.7.0_79
SmartClient Version: v12.0p_2019-11-25/PowerEdition Deployment (built 2019-11-25)
Version 78.0.3904.108 (Official Build) (64-bit)