Guillaume Le Vaillant <glv@posteo.net> writes:

> Actually, it looks like the files generated by the groveler can't be
> removed. When doing '(asdf:load-system "osicat")', if these files are
> not there cffi tries to generate them (and fails because the directory
> is read-only).

The .so needs to be kept, the rest can be removed:

--8<---------------cut here---------------start------------->8---
$ tree /gnu/store/haz3msfmr9cnlnrfai29q5csinx8l5q3-sbcl-osicat-0.7.0-1.de0c18a/
/gnu/store/haz3msfmr9cnlnrfai29q5csinx8l5q3-sbcl-osicat-0.7.0-1.de0c18a/
├── lib
│   └── sbcl
│       ├── osicat.asd
│       ├── osicat--system.fasl
│       └── posix
│           └── libosicat.so
...
--8<---------------cut here---------------end--------------->8---

-- 
Pierre Neidhardt
https://ambrevar.xyz/