Often packages install the compiled files to
`$(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/ccache` (e.g. see
guile-opengl). This path is not explicitly given in the info page, but
is used in a couple of places, and is also part of `%load-compiled-path`
variable in guile (for `"${guile}/lib/guile/2.2/ccache`).
Similarly, the site-ccache is also part of `%load-compiled-path` in
guile.
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