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diff --git a/guix/build-system/ant.scm b/guix/build-system/ant.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
+;;;
+;;; 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 (guix build-system ant)
+  #:use-module (guix store)
+  #:use-module (guix utils)
+  #:use-module (guix packages)
+  #:use-module (guix derivations)
+  #:use-module (guix search-paths)
+  #:use-module (guix build-system)
+  #:use-module (guix build-system gnu)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
+  #:export (%ant-build-system-modules
+            ant-build
+            ant-build-system))
+
+;; Commentary:
+;;
+;; Standard build procedure for Java packages using Ant.
+;;
+;; Code:
+
+(define %ant-build-system-modules
+  ;; Build-side modules imported by default.
+  `((guix build ant-build-system)
+    (guix build syscalls)
+    ,@%gnu-build-system-modules))
+
+(define (default-jdk)
+  "Return the default JDK package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((jdk-mod (resolve-interface '(gnu packages java))))
+    (module-ref jdk-mod 'icedtea)))
+
+(define (default-ant)
+  "Return the default Ant package."
+  ;; Lazily resolve the binding to avoid a circular dependency.
+  (let ((jdk-mod (resolve-interface '(gnu packages java))))
+    (module-ref jdk-mod 'ant)))
+
+(define* (lower name
+                #:key source inputs native-inputs outputs system target
+                (jdk (default-jdk))
+                (ant (default-ant))
+                #:allow-other-keys
+                #:rest arguments)
+  "Return a bag for NAME."
+  (define private-keywords
+    '(#:source #:target #:jdk #:ant #:inputs #:native-inputs))
+
+  (and (not target)                               ;XXX: no cross-compilation
+       (bag
+         (name name)
+         (system system)
+         (host-inputs `(,@(if source
+                              `(("source" ,source))
+                              '())
+                        ,@inputs
+
+                        ;; Keep the standard inputs of 'gnu-build-system'.
+                        ,@(standard-packages)))
+         (build-inputs `(("jdk" ,jdk "jdk")
+                         ("ant" ,ant)
+                         ,@native-inputs))
+         (outputs outputs)
+         (build ant-build)
+         (arguments (strip-keyword-arguments private-keywords arguments)))))
+
+(define* (ant-build store name inputs
+                    #:key
+                    (tests? #t)
+                    (test-target "tests")
+                    (configure-flags ''())
+                    (make-flags ''())
+                    (build-target "jar")
+                    (jar-name #f)
+                    (phases '(@ (guix build ant-build-system)
+                                %standard-phases))
+                    (outputs '("out"))
+                    (search-paths '())
+                    (system (%current-system))
+                    (guile #f)p
+                    (imported-modules %ant-build-system-modules)
+                    (modules '((guix build ant-build-system)
+                               (guix build utils))))
+  "Build SOURCE with INPUTS."
+  (define builder
+    `(begin
+       (use-modules ,@modules)
+       (ant-build #:name ,name
+                  #:source ,(match (assoc-ref inputs "source")
+                              (((? derivation? source))
+                               (derivation->output-path source))
+                              ((source)
+                               source)
+                              (source
+                               source))
+                  #:make-flags ,make-flags
+                  #:configure-flags ,configure-flags
+                  #:system ,system
+                  #:tests? ,tests?
+                  #:test-target ,test-target
+                  #:build-target ,build-target
+                  #:jar-name ,jar-name
+                  #:phases ,phases
+                  #:outputs %outputs
+                  #:search-paths ',(map search-path-specification->sexp
+                                        search-paths)
+                  #:inputs %build-inputs)))
+
+  (define guile-for-build
+    (match guile
+      ((? package?)
+       (package-derivation store guile system #:graft? #f))
+      (#f                               ; the default
+       (let* ((distro (resolve-interface '(gnu packages commencement)))
+              (guile  (module-ref distro 'guile-final)))
+         (package-derivation store guile system #:graft? #f)))))
+
+  (build-expression->derivation store name builder
+                                #:inputs inputs
+                                #:system system
+                                #:modules imported-modules
+                                #:outputs outputs
+                                #:guile-for-build guile-for-build))
+
+(define ant-build-system
+  (build-system
+    (name 'ant)
+    (description "The standard Ant build system")
+    (lower lower)))
+
+;;; ant.scm ends here