Embeddable Scheme interpreter [closed]

Question

I know Lua is best-in-class for embedding, but I want to use Scheme or some LISP dialect as scripting language for my C app. What are good interpreters to embed? My criteria are:

• Open source (preferably in C - I think most of them are).
• R5RS very encouraged, SRFIs are plus.
• Easy FFI with C (in both directions) - very important.
• Should be maintained, up-to-date, not dead projects.
• Performance comparable to Lua.
• Portable (at least GNU/Linux - MacOS - Windows (MinGW/Cygwin acceptable)).

I don't care about:

• Large library (with simple FFI, I'm able to add missing), but it's a plus.
• Size. I plan to run it on desktop machine, not Android/iOS.
• Rich documentation. Some samples with FFI might be enough.

For now, I consider the following:

• GNU Guile. Seems like it fits, but I don't know about performance (is it VM or interpreted?).
• newLISP. Brand new, documented, but not sure about performance and embedding too.
• TinyScheme/Chibi. Very small, R5RS, intended for embedding. Not sure about performance.

Answer 1

You should consider Chicken Scheme, too:

• Builtin support for cross-compiling applications for embedded targets

And it meets your criteria, take a look at the list of features in the linked page.