With brew, how do I only list packages that were built from source (not poured from bottle)? Is there a way to list only the packages that were built from source? I want to check what options they were built with, and since that's the main reason I install packages by building from source most of the time, this would be useful.

I imagine it wouldn't be too difficult to write a script to list all packages and filter out the ones poured from bottle, but I'm wondering if a simpler way exists.

I could just brew info and go through all of them to check, but when the output is really long, it isn't that trivial to do this.
I believe that Cakebrew lets you do that, but I can't confirm this