Re:Git 2.9 released
by tveita on Thursday June 16, 2016 @10:13AM
(#11916207)
Guile may be the closest, but it failed to gain much traction despite support in some popular GNU tools like GDB. It's certainly not installed on most systems, but it at least has a tiny chance of being present.
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On Arch Linux it's a dependency of both gdb and make, but it seems that other distributions go out of their way to avoid shipping it (Debian e.g. builds gdb without a hard dependency on it, and you need to install a separate make-guile package to get guile-enabled make).