>>105897729
>Is it even possible to package Scheme code in a portable way?
Yes, an example is https://github.com/ashinn/irregex

irregex.scm is written in a portable subset of r4-7rs, while irregex-chicken.scm, irregex-gambit.scm, irregex.sld (chibi), irregex-guile.scm, and irregex.chezscheme.sls interface with each respective scheme implementation