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diff --git a/pre-inst-env.in b/pre-inst-env.in
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+#!/bin/sh
+
+## 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/>.
+
+abs_top_srcdir="`cd "@abs_top_srcdir@" > /dev/null; pwd`"
+abs_top_builddir="`cd "@abs_top_builddir@" > /dev/null; pwd`"
+
+GUILE_LOAD_COMPILED_PATH="$abs_top_builddir${GUILE_LOAD_COMPILED_PATH:+:}$GUILE_LOAD_COMPILED_PATH"
+GUILE_LOAD_PATH="$abs_top_builddir:$abs_top_srcdir${GUILE_LOAD_PATH:+:}:$GUILE_LOAD_PATH"
+export GUILE_LOAD_COMPILED_PATH GUILE_LOAD_PATH
+
+PATH="$abs_top_builddir:$PATH"
+export PATH
+
+exec "$@"