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diff --git a/guix/build/agda-build-system.scm b/guix/build/agda-build-system.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2023 Josselin Poiret <dev@jpoiret.xyz>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build agda-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-35)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 match)
+  #:export (%standard-phases
+            agda-build))
+
+(define* (set-locpath #:key inputs native-inputs #:allow-other-keys)
+  (let ((locales (assoc-ref (or native-inputs inputs) "locales")))
+    (setenv "GUIX_LOCPATH" (string-append locales "/lib/locale"))))
+
+(define %agda-possible-extensions
+  (cons
+   ".agda"
+   (map (cute string-append ".lagda" <>)
+        '(""
+          ".md"
+          ".org"
+          ".rst"
+          ".tex"))))
+
+(define (pattern-predicate pattern)
+  (define compiled-rx (make-regexp pattern))
+  (lambda (file stat)
+    (regexp-exec compiled-rx file)))
+
+(define* (build #:key plan #:allow-other-keys)
+  (for-each
+   (match-lambda
+     ((pattern . options)
+      (for-each
+       (lambda (file)
+         (apply invoke (cons* "agda" file options)))
+       (let ((files (find-files "." (pattern-predicate pattern))))
+         (if (null? files)
+             (raise
+              (make-compound-condition
+               (condition
+                (&message
+                 (message (format #f "Plan pattern `~a' did not match any files"
+                                  pattern))))
+               (condition
+                (&error))))
+             files))))
+     (x
+      (raise
+       (make-compound-condition
+        (condition
+         (&message
+          (message (format #f "Malformed plan element `~a'" x))))
+        (condition
+         (&error))))))
+   plan))
+
+(define* (install #:key outputs name extra-files #:allow-other-keys)
+  (define libdir (string-append (assoc-ref outputs "out") "/lib/agda/" name))
+  (define agda-version
+    (car (scandir "./_build/"
+                  (lambda (entry)
+                    (not (member entry '("." "..")))))))
+  (define agdai-files
+    (with-directory-excursion
+        (string-join (list "." "_build" agda-version "agda") "/")
+      (find-files ".")))
+  (define (install-source agdai)
+    (define dir (dirname agdai))
+    ;; Drop .agdai
+    (define no-ext (string-drop-right agdai 6))
+    (define source
+      (match (filter file-exists? (map (cute string-append no-ext <>)
+                                       %agda-possible-extensions))
+        ((single) single)
+        (res (raise
+              (make-compound-condition
+               (condition
+                (&message
+                 (message
+                  (format #f
+                          "Cannot find unique source file for agdai file `~a`, got `~a`"
+                          agdai res))))
+               (condition
+                (&error)))))))
+    (install-file source (string-append libdir "/" dir)))
+  (for-each install-source agdai-files)
+  (copy-recursively "_build" (string-append libdir "/_build"))
+  (for-each
+   (lambda (pattern)
+     (for-each
+      (lambda (file)
+        (install-file file libdir))
+      (find-files "." (pattern-predicate pattern))))
+   extra-files))
+
+(define %standard-phases
+  (modify-phases gnu:%standard-phases
+    (add-before 'install-locale 'set-locpath set-locpath)
+    (delete 'bootstrap)
+    (delete 'configure)
+    (replace 'build build)
+    (delete 'check) ;; No universal checker
+    (replace 'install install)))
+
+(define* (agda-build #:key inputs (phases %standard-phases)
+                     #:allow-other-keys #:rest args)
+  "Build the given Agda package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))