I was able to build the maven command:
mvn clean install -Dgenerate-target-platform=true
And I managed to find the file: portfolio-app/ide-target-platform/portfolio-ide.target
The next step is:
In the resulting editor, click on the “Set as Target Platform” link at the top right (this may also take a while)
When I just click on the portfolio-ide.target file I was getting the wrong editor (It just said that “/ide-target-platform/portfolio-ide.target” was not a resource or something? )
To get the correct “Target Editor” I needed to right click on the target file and use the “Open With>Other…” then select “Target Editor”.
Having done that, I was able to click on the “Set as Target Platform” link.
The file “portfolio-ide.target” looks like this:
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <?pde version="3.8"?>