diff --git a/manifests/extension/runkit.pp b/manifests/extension/runkit.pp
new file mode 100644
index 0000000..36e9ba4
--- /dev/null
+++ b/manifests/extension/runkit.pp
@@ -0,0 +1,58 @@
+# Installs a php extension for a specific version of php.
+#
+# Usage:
+#
+#     php::extension::runkit { 'runkit for 5.4.10':
+#       php     => '5.4.10',
+#       version => '1.0.3'
+#     }
+#
+define php::extension::runkit(
+  $php,
+  $version = '1.0.3'
+) {
+  include boxen::config
+
+  require php::config
+  
+  # Ensure that the specified version of PHP is installed.
+  php_require($php)
+
+  $extension = 'runkit'
+
+  # Final module install path
+  $module_path = "${php::config::root}/versions/${php}/modules/${extension}.so"
+
+  # Clone the source respository
+  repository { "${php::config::extensioncachedir}/runkit":
+    source => 'namesco/runkit'
+  }
+
+
+  # Additional options
+  $configure_params = ''
+
+  php_extension { $name:
+    provider         => 'git',
+
+    extension        => $extension,
+    version          => $version,
+
+    homebrew_path    => $boxen::config::homebrewdir,
+    phpenv_root      => $php::config::root,
+    php_version      => $php,
+
+    cache_dir        => $php::config::extensioncachedir,
+    require          => Repository["${php::config::extensioncachedir}/runkit"],
+
+    configure_params => $configure_params,
+  }
+
+  # Add config file once extension is installed
+
+  file { "${php::config::configdir}/${php}/conf.d/${extension}.ini":
+    content => template('php/extensions/runkit.ini.erb'),
+    require => Php_extension[$name],
+  }
+
+}
diff --git a/spec/defines/extensions/php_extension_runkit_spec.rb b/spec/defines/extensions/php_extension_runkit_spec.rb
new file mode 100644
index 0000000..34a77d2
--- /dev/null
+++ b/spec/defines/extensions/php_extension_runkit_spec.rb
@@ -0,0 +1,37 @@
+require 'spec_helper'
+
+describe "php::extension::runkit" do
+  let(:facts) { default_test_facts }
+  let(:title) { "runkit for 5.4.17" }
+  let(:params) do
+    {
+      :php     => "5.4.17",
+      :version => "1.0.3"
+    }
+  end
+
+  it do
+    should contain_class("php::config")
+    should contain_php__version("5.4.17")
+
+    should contain_repository("/test/boxen/data/php/cache/extensions/runkit").with({
+      :source => "namesco/runkit"
+    })
+
+    should contain_php_extension("runkit for 5.4.17").with({
+      :provider         => "git",
+      :extension        => "runkit",
+      :version          => "1.0.3",
+      :homebrew_path    => "/test/boxen/homebrew",
+      :phpenv_root      => "/test/boxen/phpenv",
+      :php_version      => "5.4.17",
+      :cache_dir        => "/test/boxen/data/php/cache/extensions",
+      :require          => "Repository[/test/boxen/data/php/cache/extensions/runkit]",
+    })
+
+    should contain_file("/test/boxen/config/php/5.4.17/conf.d/runkit.ini").with({
+      :content => File.read("spec/fixtures/runkit.ini"),
+      :require => "Php_extension[runkit for 5.4.17]"
+    })
+  end
+end
diff --git a/spec/fixtures/runkit.ini b/spec/fixtures/runkit.ini
new file mode 100644
index 0000000..d365c43
--- /dev/null
+++ b/spec/fixtures/runkit.ini
@@ -0,0 +1,3 @@
+extension=/test/boxen/phpenv/versions/5.4.17/modules/runkit.so
+
+runkit.internal_override=1
\ No newline at end of file
diff --git a/templates/extensions/runkit.ini.erb b/templates/extensions/runkit.ini.erb
new file mode 100644
index 0000000..cd20708
--- /dev/null
+++ b/templates/extensions/runkit.ini.erb
@@ -0,0 +1,3 @@
+extension=<%= @module_path %>
+
+runkit.internal_override=1
\ No newline at end of file
diff --git a/templates/extensions/zend_generic.ini.erb b/templates/extensions/zend_generic.ini.erb
new file mode 100644
index 0000000..8affacc
--- /dev/null
+++ b/templates/extensions/zend_generic.ini.erb
@@ -0,0 +1 @@
+zend_extension=<%= @module_path %>