guix-commits@gnu.org writes:

> commit 481a0f1a7ceac666a011b28324220584ead07698
> Author: Efraim Flashner <efraim@flashner.co.il>
> AuthorDate: Thu Feb 13 10:54:29 2020 +0200
>
>     build: gnu-build-system: Don't run configure during bootstrap.
>     
>     * guix/build/gnu-build-system.scm (bootstrap): Add NOCONFIGURE
>     environment variable before running bootstrap scripts.

[...]

> @@ -190,6 +190,7 @@ working directory."
>                (if (executable-file? script)
>                    (begin
>                      (patch-shebang script)
> +                    (setenv "NOCONFIGURE" "true")
>                      (invoke script))
>                    (invoke "sh" script)))
>              (if (or (file-exists? "configure.ac")

Should we unset NOCONFIGURE afterwards?  Probably at least one package
uses this variable for something completely different...