Remove dynamic code from gemspec because it can only be built one way

Gemfile

@@ -1,14 +1,13 @@
 source 'http://rubygems.org'
 
-gemspec
-
 # Bundle gems for the local environment. Make sure to
 # put test-only gems in this group so their generators
 # and rake tasks are available in development mode:
 group :development, :test do
   gem 'rails', '~> 3.0.7'
 
-  if 'java' == RUBY_PLATFORM
+  platforms :jruby do
+    gem 'jruby-openssl', '~> 0.7'
     case ENV['CI_DB_ADAPTER']
     when 'mysql'
       gem 'activerecord-jdbcmysql-adapter', '~> 1.1', :platform => :jruby
@@ -20,7 +19,9 @@ group :development, :test do
       gem 'activerecord-jdbcsqlite3-adapter', '~> 1.1', :platform => :jruby
       gem 'jdbc-sqlite3', '~> 3.6', :platform => :jruby
     end
-  else
+  end
+
+  platforms :ruby, :mswin, :mingw do
     case ENV['CI_DB_ADAPTER']
     when 'mysql'
       gem 'mysql', '~> 2.8'
@@ -30,7 +31,10 @@ group :development, :test do
       gem 'sqlite3', '~> 1.3'
     end
   end
-  gem "cancan" if ENV["AUTHORIZATION_ADAPTER"] == "cancan"
+
+  gem 'cancan' if ENV['AUTHORIZATION_ADAPTER'] == 'cancan'
   gem 'factory_girl', '2.0.0.beta2'
   gem 'generator_spec'
 end
+
+gemspec

rails_admin.gemspec

@@ -14,7 +14,6 @@ Gem::Specification.new do |s|
   s.add_development_dependency('ZenTest', '~> 4.5')
   # If you add a runtime dependency, please maintain alphabetical order
   s.add_runtime_dependency('builder', '~> 2.1.0')
-  s.add_runtime_dependency('jruby-openssl', '~> 0.7.2') if RUBY_PLATFORM == 'java'
   s.add_runtime_dependency('rails', '~> 3.0.6')
   s.authors = ["Erik Michaels-Ober", "Bogdan Gaza"]
   s.description = %q{RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data}

spec/dummy_app/Gemfile

@@ -6,11 +6,10 @@ gem 'paperclip', '~> 2.3'
 gem 'rails_admin', :path => '../../'
 gem 'mlb'
 
-# Bundle gems for the local environment. Make sure to
-# put test-only gems in this group so their generators
-# and rake tasks are available in development mode:
 group :development, :test do
-  if 'java' == RUBY_PLATFORM
+
+  platforms :jruby do
+    gem 'jruby-openssl', '~> 0.7'
     case ENV['CI_DB_ADAPTER']
     when 'mysql'
       gem 'activerecord-jdbcmysql-adapter', '~> 1.1', :platform => :jruby
@@ -22,7 +21,9 @@ group :development, :test do
       gem 'activerecord-jdbcsqlite3-adapter', '~> 1.1', :platform => :jruby
       gem 'jdbc-sqlite3', '~> 3.6', :platform => :jruby
     end
-  else
+  end
+
+  platforms :ruby, :mswin, :mingw do
     case ENV['CI_DB_ADAPTER']
     when 'mysql'
       gem 'mysql', '~> 2.8'
@@ -32,4 +33,5 @@ group :development, :test do
       gem 'sqlite3', '~> 1.3'
     end
   end
+
 end