I noticed for the past month (or 2), you can't build the cef project if you follow the directions from the page.
Specifically, the issue with symbols was solved here https://bitbucket.org/chromiumembedded/ ... cessconfig
It was solved in November, 2017 but it doesn't seem the fix made it to https://bitbucket.org/chromiumembedded/cef-project.git (or the Spotify builder?) yet
Can you update the version that is referenced? Or...where/how do I build a newer version with this fix?