gnu: Add grfcodec.

* gnu/packages/game-development.scm (grfcodec): New variable.

gnu/packages/game-development.scm

@@ -35,6 +35,7 @@ (define-module (gnu packages game-development)
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system python)
   #:use-module (gnu packages)
+  #:use-module (gnu packages boost)
   #:use-module (gnu packages curl)
   #:use-module (gnu packages databases)
   #:use-module (gnu packages documentation)
@@ -146,6 +147,65 @@ (define-public deutex
 DeuTex has functions such as merging wads, etc.")
    (license license:gpl2+)))
 
+(define-public grfcodec
+  (package
+    (name "grfcodec")
+    (version "6.0.6")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://binaries.openttd.org/extra/"
+                                  name "/" version "/" name "-" version
+                                  "-source.tar.xz"))
+              (sha256
+               (base32
+                "08admgnpqcsifpicbm56apgv360fxapqpbbsp10qyk8i22w1ivsk"))))
+    (build-system gnu-build-system)
+    (arguments
+     '(#:tests? #f ; no check target
+       #:phases
+      (modify-phases %standard-phases
+        (delete 'configure) ; no configure script
+        (replace 'install   ; no install target
+          (lambda* (#:key outputs #:allow-other-keys)
+            (let* ((out (assoc-ref outputs "out"))
+                   (bin (string-append out "/bin"))
+                   (doc (string-append out "/share/doc"))
+                   (man (string-append out "/share/man/man1")))
+              (for-each (lambda (file)
+                          (install-file file bin))
+                        '("grfcodec" "grfid" "grfstrip" "nforenum"))
+              (install-file "COPYING" doc)
+              (with-directory-excursion "docs"
+                (for-each (lambda (file)
+                            (install-file (string-append file ".txt") doc))
+                          '("auto_correct" "commands" "grf" "grfcodec" "grftut"
+                            "readme" "readme.rpn"))
+                (for-each (lambda (file)
+                            (install-file file man))
+                          (find-files "." "\\.1"))))
+            #t)))))
+    (inputs
+     `(("boost" ,boost)
+       ("libpng" ,libpng)
+       ("zlib" ,zlib)))
+    (synopsis "GRF development tools")
+    (description
+     "The @dfn{GRF} (Graphics Resource File) development tools are a set of
+tools for developing (New)GRFs. It includes a number of smaller programs, each
+with a specific task:
+@enumerate
+@item @code{grfcodec} decodes and encodes GRF files for OpenTTD.
+@item @code{grfid} extracts the so-called \"GRF ID\" from a GRF.
+@item @code{grfstrip} strips all sprites from a GRF.
+@item @code{nforenum} checks NFO code for errors, making corrections when
+necessary.
+@end enumerate")
+    (home-page "http://dev.openttdcoop.org/projects/grfcodec")
+    ;; GRFCodec, GRFID, and GRFStrip are exclusively under the GPL2.
+    ;; NFORenum is under the GPL2+.
+    ;; The MD5 implementation contained in GRFID is under the zlib license.
+    (license (list license:gpl2 license:gpl2+ license:zlib))))
+
 (define-public gzochi
   (package
     (name "gzochi")