How to make catkin compile packages within a metapackage?

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I'm using hydro with catkin (v. 0.5.77) and I'm using a metapackage because I want to enhance a rosbuild-stack, which I catkinized. My problem is, that catkin_make recognizes my metapackage, but doesn't touch (in terms of compile) the package within the metapackage.

To show the problem, I created a metapackage called "metapackage" in catkins source directory (~/catkin_ws/src/metapackage) and a package "package1" in the directory of the metapackage (~/catkin_ws/src/metapackage/package1). The package "package1" is working fine and compiling, when I move it in catkins source directory. But if it's in the metapackages directory, it isn't touched by catkin.

I went through all the ros-answers questions and the wiki, but I didn't find another way telling catkin about my package except the run_depend-tag, which doesn't change anything.

Thanks in advance.

Information

• That's the CMakeLists.txt of my metapackage:

cmake_minimum_required(VERSION 2.8.3)
project(metapackage)
find_package(catkin REQUIRED)
catkin_metapackage()

• That's the package.xml of my metapackage:

<?xml version="1.0"?>
<package>
  <name>metapackage</name>
  <version>0.0.0</version>
  <description>The metapackage package</description>

  <maintainer <a href="mailto:email="user@todo.todo">user</maintainer">email="user@todo.todo">user</maintainer</a>>
  <license>TODO</license>

  <buildtool_depend>catkin</buildtool_depend>
  <run_depend>package1</run_depend>


  <!-- The export tag contains other, unspecified, tags -->
  <export>
    <!-- You can specify that this package is a metapackage here: -->
    <metapackage/>
    <!-- Other tools can request additional information be placed here-->

  </export>
</package>

• If it's interesting, that's my toplevel CMakeLists.txt: pastebin.com/h6ssccXC
  (it needs a http:// prefix as I do not have enough karma to post links, but it's too long to post it here)