We're pleased to announce that pre-built images are RE-available starting from webOS OSE 2.20.0. 
You can download the images from the GitHub Releases page.
Until now, thanks to the dedication of the WebOS Ports community, we were able to provide pre-built images for webOS OSE. But this way had a few problems hard to solve, and it has become unsustainable.
So we tested several options for replacing it and decided to publish the images via GitHub Releases.
Pre-built images will be uploaded 2~3 days after the source codes are released.
See also the blog news.