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+;;; extract-green-color --- Extract green color from a photo of LCD Writing Tablet.
+;;; Copyright © 2021 Masaya Tojo <masaya@tojo.tokyo>
+;;;
+;;; This file is part of extract-green-color.
+;;;
+;;; Extract-green-color 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.
+;;;
+;;; Extract-green-color 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/>.
+
+(use-modules (guix packages)
+             ((guix licenses) #:prefix license:)
+             (guix git-download)
+             (guix build-system gnu)
+             (gnu packages)
+             (gnu packages autotools)
+             (gnu packages guile)
+             (gnu packages guile-xyz)
+             (gnu packages pkg-config)
+             (gnu packages texinfo))
+
+(define extract-green-color
+  (package
+   (name "extract-green-color")
+   (version "1.0.0")
+   (source (string-append (getcwd) "/extract-green-color-" version ".tar.gz"))
+   (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+)))
+
+extract-green-color