[ant] javah task, which package?

Hi,

which package install ant's javah task?

At the moment i get the error:
/build.xml:64: Problem: failed to create task or type javah
Cause: the class org.apache.tools.ant.taskdefs.optional.Javah was not found.
         This looks like one of Ant's optional components.
Action: Check that the appropriate optional JAR exists in
         -/usr/share/ant-core/lib
         -/root/.ant/lib
         -a directory added on the command line with the -lib argument

At the moment, only dev-java/ant-core is installed. And i don't want to 
install dev-java/ant with all its thousand dependencies.
And i also need precise dependencies for my private ebuild, that's going 
to use ant to build some JNI stuff.

Any help appreciated.


Regards,
   Sven