gnu: Add perl6-xml-writer.

* gnu/packages/perl6.scm (perl6-xml-writer): New variable.

gnu/packages/perl6.scm

@@ -500,6 +500,30 @@ some confidence that they have a working distribution META description file.")
 character numbering.")
     (license license:artistic2.0)))
 
+(define-public perl6-xml-writer
+  ;; Last commit was May 2017
+  (let ((commit "4d30a9d8e06033ca97387971b653817becd5a759")
+        (revision "1"))
+    (package
+      (name "perl6-xml-writer")
+      (version (git-version "0.0.0" revision commit))
+      (source
+        (origin
+          (method git-fetch)
+          (uri (git-reference
+                 (url "https://github.com/masak/xml-writer")
+                 (commit commit)))
+          (file-name (git-file-name name version))
+          (sha256
+           (base32
+            "1kwrf7akp70kyzw1b90khp71a6hpilihwndy2jsjpffcd4hd4m4z"))))
+      (build-system rakudo-build-system)
+      (arguments '(#:with-zef? #f))
+      (home-page "https://github.com/masak/xml-writer")
+      (synopsis "Perl 6 module to generate XML")
+      (description "@code{XML::Writer} is a module for creating XML in Perl 6.")
+      (license license:artistic2.0))))
+
 (define-public perl6-zef
   (package
     (name "perl6-zef")