title: Use makefile variables inside tcsh
body: <p>I created a <code>tcsh</code> script, which I want to call through a <code>Makefile</code> environment. Therefore
  I want to reference variables inside this tcsh script, which I have defined in the <code>Makefile</code> environment.
  I tried to reference environment variables as <code>$?VARIABLE</code>, but this does not work on variables from the <code>Makefile</code> environment.
  How can I do this?</p>