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Guix build local module

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FIXED: rename name on line 9 of the first snippet, and use "my-hello" instead of "hello".

Inside a file named build.scm:

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(define-module (build)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system gnu)
  #:use-module (guix licenses))

(define-public my-hello
  (package
    (name "hello")
    (version "2.10")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://gnu/hello/hello-" version
                                  ".tar.gz"))
              (sha256
               (base32
                "0ssi1wpaf7plaswqqjwigppsg5fyh99vdlb9kzl7c9lng89ndq1i"))))
    (build-system gnu-build-system)
    (synopsis "")
    (description "")
    (home-page "")
    (license gpl3+)))

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A plain build command didn’t work:

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$ guix build -L. my-hello
guix build: error: my-hello : paquet inconnu

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But with an eval expression it did:

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$ guix build -L. -e '(@ (build) my-hello)'
# works

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