Can't build nokogiri-happymapper out of the box about happymapper

[Confusion]

Here's a patch:

diff --git a/lib/happymapper.rb b/lib/happymapper.rb
index e88e150..e34cce1 100644
--- a/lib/happymapper.rb
+++ b/lib/happymapper.rb
@@ -7,8 +7,6 @@ class XmlContent; end

 module HappyMapper

-  VERSION = "0.5.6"
-
   DEFAULT_NS = "happymapper"

   def self.included(base)
diff --git a/lib/version.rb b/lib/version.rb
new file mode 100644
index 0000000..16147c2
--- /dev/null
+++ b/lib/version.rb
@@ -0,0 +1,3 @@
+module HappyMapper
+  VERSION = "0.5.6"
+end
diff --git a/nokogiri-happymapper.gemspec b/nokogiri-happymapper.gemspec
index bf86309..561263e 100644
--- a/nokogiri-happymapper.gemspec
+++ b/nokogiri-happymapper.gemspec
@@ -1,4 +1,4 @@
-require File.dirname(__FILE__) + '/lib/happymapper'
+require File.dirname(__FILE__) + '/lib/version'

 module HappyMapper
   def self.show_version_changes(version)

[Confusion]

Hmmm, I attempted to add the pull request to this issue, but it's now in #23