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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
+;;;
+;;; 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 (gnu packages gprolog)
+ #:use-module (guix licenses)
+ #:use-module (guix packages)
+ #:use-module (guix download)
+ #:use-module (guix build-system gnu))
+
+(define-public gprolog
+ (package
+ (name "gprolog")
+ (version "1.4.2")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append "http://www.gprolog.org/gprolog-"
+ version ".tar.gz"))
+ (sha256
+ (base32
+ "0y25c2gwz41i6g28qyfjklrmanzgk0c8cr4jn2s7s8qgd9dnm1fm"))))
+ (build-system gnu-build-system)
+ (arguments
+ `(#:phases (alist-cons-before
+ 'configure 'change-dir-n-fix-shells
+ (lambda _
+ (chdir "src")
+ (substitute* "configure"
+ (("-/bin/sh") (string-append "-" (which "sh")))
+ (("= /bin/sh") (string-append "= " (which "sh")))))
+ %standard-phases)))
+ (home-page "https://www.gnu.org/software/gprolog/")
+ (synopsis
+ "GNU Prolog, a free Prolog compiler with constraint solving over
+finite domains")
+ (description
+ "GNU Prolog is a free Prolog compiler with constraint solving over
+finite domains developed by Daniel Diaz.
+
+GNU Prolog accepts Prolog+constraint programs and produces native
+binaries (like gcc does from a C source). The obtained executable is
+then stand-alone. The size of this executable can be quite small since
+GNU Prolog can avoid to link the code of most unused built-in
+predicates. The performances of GNU Prolog are very
+encouraging (comparable to commercial systems).
+
+Beside the native-code compilation, GNU Prolog offers a classical
+interactive interpreter (top-level) with a debugger.
+
+The Prolog part conforms to the ISO standard for Prolog with many
+extensions very useful in practice (e.g., global variables, OS
+interface, sockets).
+
+GNU Prolog also includes an efficient constraint solver over finite domains.
+This opens contraint logic programming to the user combining the power of
+constraint programming to the declarativity of logic programming.")
+ (license (list gpl2+ lgpl3+)))) \ No newline at end of file