We have a multi module build with modules using different technologies, like Java and Flex. Is it somehow possible to activate different profiles based on the module that is compiled currently?

I tried it with an activation like

<profile>
  <id>flex</id>
  <activation>
    <file>
      <exists>${basedir}/src/main/flex</exists>
    </file>
  </activation>
  ...
</profile

But it didn't work, although the use of ${basedir} is documented in the Maven documentation (this is a bug in Maven). Is there a different possibility to have different activations based on the current module? Or does Maven only allow to activate a profile for all modules or not at all?