Guile Emacs is a real challenge to build. There's lots of helpful advice on the wiki, but compiles are slow and prove to segfaults.
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The Guile contributors are some extremely talented lispers. Missing a parenthesis in lisp docs is done by every lisper once in a while though :)
Apparently it's common for Scheme implementations (not just Guile) to include partial demo implementations of other programming languages.
How hard is it to compile Guile Emacs? Recent GCC has started optimising the code such that malloc doesn't work!