Hi! I’m the one working on the bevel profiles project. (For future reference, there’s a thread about it here)
While this builds on Linux where I’m working, and I’m not sure why it doesn’t looking at the line in bmesh_opdefines.c from your error, if there was an area it was going to fail, this would probably be it. I haven’t made the bevel tool -> bmesh operator transition work properly yet-- I’ve been testing with the bevel modifier.
Because I don’t have working visual results yet, I haven’t focused on getting all the builds working correctly yet, but I’m happy for your interest! I’ll let you know when I fix the tool (hopefully resolving this build issue). I’m hoping to have a few cases of the bevel operator working by the end of the week, so that will probably be when I look into it.