Open-source projects with non-recursive makefiles?

I'm building a tool to analyze and convert make-based build systems, and I'm looking for some test cases to see how it scales. At this point, it can't deal with recursive makefiles (leaving aside that these are bad practice, cf. Morris' seminal "Recursive Make Considered Harmful", incidentally one of the few good uses of the 'considered harmful' name), so I'd love to see any examples of large non-recursive make-based buildsystems.