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diff --git a/tojo-tokyo/packages/guile-xyz.scm b/tojo-tokyo/packages/guile-xyz.scm
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+;;; tojo-tokyo-guix-config --- Guix Channel for git.tojo.tokyo's package
+;;; Copyright © 2021 Masaya Tojo <masaya@tojo.tokyo>
+;;;
+;;; This file is part of tojo-tokyo-guix-config.
+;;;
+;;; tojo-tokyo-guix-config 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.
+;;;
+;;; tojo-tokyo-guix-config 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 extract-green-color.  If not, see
+;;; <http://www.gnu.org/licenses/>.
+
+(define-module (tojo-tokyo packages guile-xyz)
+  #:use-module (guix packages)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (guix download)
+  #:use-module (guix build-system gnu)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages autotools)
+  #:use-module (gnu packages guile)
+  #:use-module (gnu packages guile-xyz)
+  #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages texinfo))
+
+(define-public extract-green-color
+  (package
+    (name "extract-green-color")
+    (version "1.0.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://files.tojo.tokyo/extract-green-color/"
+                    "extract-green-color-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0jrcvm4lk06009bq81r4fnpknmhwz6bgg4w3v2qh2kp83b9bgb1r"))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("autoconf" ,autoconf)
+       ("automake" ,automake)
+       ("pkg-config" ,pkg-config)
+       ("texinfo" ,texinfo)))
+    (inputs
+     `(("guile" ,guile-2.2)
+       ("guile-cv" ,guile-cv)))
+    (synopsis "Extract green color from a photo of LCD Writing Tablet")
+    (description "This package provides script to extract green color
+from a photo of LCD Writing Tablet.")
+    (home-page "https://git.tojo.tokyo/extract-green-color.git")
+    (license license:gpl3+)))