Julien Lepiller schreef op vr 04-03-2022 om 10:59 [+0100]: > +           ((#:configure-flags _) > +            `(list "-DCLANG_INCLUDE_TESTS=True" This is a bit fragile. If the definition of the 'clang' package mad the #:configure-flags a gexp, then this would fail because of the 'sexp->gexp' optimisation in 'cmake-build-system'. As such, I recommend #~(list "-DCLANG_INCLUDE_TESTS=True" ...) here instead of sexp quasiquoting. Greetings, Maxime.