From fe45656791b699f05c8cd888cf62c7360c20eea4 Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Fri, 27 Nov 2020 20:45:42 -0300
Subject: /home/andreh/dev/libre/dotfiles/scripts/ad-hoc/pastebin.sh: Auto-add
 _pastebins/2020-11-27-guix-build-local-module.md

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+---
+title: Guix build local module
+date: 2020-11-27
+layout: post
+lang: en
+---
+
+Inside a file named `build.scm`:
+```scheme
+(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+)))
+
+```
+
+A plain build command didn't work:
+
+```shell
+$ guix build -L. my-hello
+guix build: error: my-hello : paquet inconnu
+``` 
+
+But with an eval expression it did:
+
+```shell
+$ guix build -L. -e '(@ (build) my-hello)'
+# works
+
+```
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