Dear Guixters, According to Rekado, the error message, I get when using pre-inst-env script, is irrevelant. I quote : « the lack of an appropriate error message is not good. […] The error message should say what things are missing instead of printing a misleading error message about the package. » Here is my command line history : $ git clone https://git.savannah.gnu.org/git/guix.git $ cd guix $ guix environment --pure guix [dev]$ ./bootstrap && ./configure --localstatedir=/var && make && exit … $ ./pre-inst-env guix build artanis guix: build: command not found Try `guix --help' for more information. For what it worth, I run Guix on Ubuntu 20.04. Cheers, Jérémy