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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@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 mingw)
+  #:use-module ((guix licenses) #:prefix license:)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages base)
+  #:use-module (gnu packages cross-base)
+  #:use-module (gnu packages gcc)
+  #:use-module (gnu packages compression)
+  #:use-module (gnu packages multiprecision)
+  #:use-module (guix build-system gnu)
+  #:use-module (guix packages)
+  #:use-module (guix download)
+  #:use-module (guix utils)
+  #:use-module (ice-9 match))
+
+(define %mingw-triplet
+  "i686-w64-mingw32")
+
+(define-public mingw-w64
+  (package
+    (name "mingw-w64")
+    (version "5.0-rc2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append
+                    "https://sourceforge.net/projects/mingw-w64/files/mingw-w64/"
+                    "mingw-w64-release/mingw-w64-v" version ".tar.bz2"))
+              (sha256
+               (base32 "0imdary8j07if8ih73pfgxiclpf2ax8h3mz8mxln07i8sbbd30c9"))
+              (patches (search-patches "mingw-w64-5.0rc2-gcc-4.9.3.patch"))))
+    (native-inputs `(("xgcc-core" ,(cross-gcc %mingw-triplet))
+                     ("xbinutils" ,(cross-binutils %mingw-triplet))))
+    (build-system gnu-build-system)
+    (search-paths
+     (list (search-path-specification
+            (variable "CROSS_C_INCLUDE_PATH")
+            (files '("include" "i686-w64-mingw32/include")))
+           (search-path-specification
+            (variable "CROSS_LIBRARY_PATH")
+            (files
+             '("lib" "lib64" "i686-w64-mingw32/lib" "i686-w64-mingw32/lib64")))))
+    (arguments
+     `(#:configure-flags '("--host=i686-w64-mingw32")
+       #:phases
+       (modify-phases %standard-phases
+         (add-before 'configure 'setenv
+           (lambda* (#:key inputs #:allow-other-keys)
+             (let ((xgcc-core (assoc-ref inputs "xgcc-core"))
+                   (mingw-headers (string-append (getcwd) "/mingw-w64-headers")))
+               (setenv "CPP"
+                       (string-append xgcc-core "/bin/i686-w64-mingw32-cpp"))
+               (setenv "CROSS_C_INCLUDE_PATH"
+                       (string-append
+                        mingw-headers
+                        ":" mingw-headers "/include"
+                        ":" mingw-headers "/crt"
+                        ":" mingw-headers "/defaults/include"
+                        ":" mingw-headers "/direct-x/include"))))))
+       #:make-flags (list "DEFS=-DHAVE_CONFIG_H -D__MINGW_HAS_DXSDK=1")
+       #:tests? #f ; compiles and includes glibc headers
+       #:strip-binaries? #f))
+    (home-page "http://mingw.org")
+    (synopsis "Minimalist GNU for Windows")
+    (description "MinGW provides a complete Open Source programming tool set
+which is suitable for the development of native MS-Windows applications, and
+which does not depend on any 3rd-party C-Runtime dlls.")
+    (license license:fdl1.3+)))