autoconf magic I wish I knew about years ago: you can fetch data from pkgconfig files and store them in environment variables which you can then use to substitute into template files! this is *perfect* for automagically getting the absolute file names of shared libraries and I have 2 projects that will greatly benefit from this.
thanks to the guile-git configure.ac file: https://gitlab.com/guile-git/guile-git/-/blob/master/configure.ac#L39
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