Attached a Ruby module in preparation of Nokogiri support.

(I am pretty close as described in
https://github.com/pjotrp/guix-notes/blob/master/RUBYGEMS-Nokogiri.org).

Cucumber support comes later (it depends on Nokogiri itself).

David: there are quite a few modules now that build gems through 'rake
gem'.  Would it be an idea to try that by default when there is no
gemspec file?

Pj.
>From e54bb659ccc3a91072214b00e5bdb6b9fbe448e5 Mon Sep 17 00:00:00 2001
From: pjotrp <[email protected]>
Date: Sat, 4 Jul 2015 15:00:09 +0200
Subject: [PATCH]     gnu: Add Ruby rake-compiler.

    * gnu/packages/ruby.scm (ruby-rake-compiler): New variable.
---
 gnu/packages/ruby.scm |   36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/gnu/packages/ruby.scm b/gnu/packages/ruby.scm
index af87cf5..8c86a14 100644
--- a/gnu/packages/ruby.scm
+++ b/gnu/packages/ruby.scm
@@ -177,6 +177,42 @@ announcement.")
     (home-page "http://www.zenspider.com/projects/hoe.html";)
     (license license:expat)))
 
+(define-public ruby-rake-compiler
+  (package
+    (name "ruby-rake-compiler")
+    (version "0.9.5")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://github.com/rake-compiler/rake-compiler/archive/v";
+                                  version ".tar.gz"))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "07lk1vl0jqcaqwjjhmg0qshqwcxdyr5kscc9xxm13m03835xgpf3"))
+    (snippet
+     '(begin
+	;; Remove cucumber test file (dependencies do not resolve right now)
+	(delete-file "tasks/cucumber.rake")))))
+    (build-system ruby-build-system)
+    (arguments
+     '(
+       #:tests? #f
+       #:phases (alist-replace
+                 'build
+                 (lambda _ (zero? (system* "rake" "gem")))
+                 %standard-phases))
+
+     )
+    (native-inputs
+     `(("ruby-rspec" ,ruby-rspec)))
+    (synopsis "Building and packaging helper for Ruby extensions")
+    (description "A productivity tool for Ruby developers. Its goal is
+to make the busy developer's life easier by simplifying the building
+and packaging of Ruby extensions by simplifying code and reducing
+duplication.")
+    (home-page "https://github.com/rake-compiler/rake-compiler";)
+    (license license:x11)))
+
 (define-public ruby-i18n
   (package
     (name "ruby-i18n")
-- 
1.7.10.4

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