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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2019 Amin Bandali <bandali@gnu.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 lean)
+ #:use-module (gnu packages multiprecision)
+ #:use-module (guix build-system cmake)
+ #:use-module ((guix licenses) #:prefix license:)
+ #:use-module (guix packages)
+ #:use-module (guix git-download))
+
+(define-public lean
+ (package
+ (name "lean")
+ (version "3.5.0")
+ (home-page "https://github.com/leanprover-community/lean")
+ (source (origin
+ (method git-fetch)
+ (uri (git-reference (url home-page)
+ (commit (string-append "v" version))))
+ (file-name (git-file-name name version))
+ (sha256
+ (base32
+ "1fdblq8ckrv6wqxfl4ybcs3ybfq7y096c9f5j4j75ymb14r401lr"))))
+ (build-system cmake-build-system)
+ (inputs
+ `(("gmp" ,gmp)))
+ (arguments
+ `(#:build-type "Release" ; default upstream build type
+ #:phases
+ (modify-phases %standard-phases
+ (add-after 'patch-source-shebangs 'patch-tests-shebangs
+ (lambda _
+ (let ((sh (which "sh"))
+ (bash (which "bash")))
+ (substitute* (find-files "tests/lean" "\\.sh$")
+ (("#![[:blank:]]?/bin/sh")
+ (string-append "#!" sh))
+ (("#![[:blank:]]?/bin/bash")
+ (string-append "#!" bash))
+ (("#![[:blank:]]?usr/bin/env bash")
+ (string-append "#!" bash)))
+ #t)))
+ (add-before 'configure 'chdir-to-src
+ (lambda _ (chdir "src") #t)))))
+ (synopsis "The Lean theorem prover and programming language")
+ (description
+ "Lean is a theorem prover and programming language with a small trusted
+core based on dependent typed theory, aiming to bridge the gap between
+interactive and automated theorem proving.")
+ (license license:asl2.0)))