Building a cmake-based package

[Randolph M. Fritz]

The shell commands I'd like to write for the configure step are:
  cd ${worksrcpath}
  cmake -G 'Unix Makefiles'

After that, I think everything will just drop into place.

So far, though, I can't figure out what to write in the "configure" 
step to get this to happen.  I've tried numerous variations on:
  configure	    {
    cd ${worksrcpath}
    exec cmake -G {Unix Makefiles}
  }
but so far no joy.

I'm sure it's simple once one knows how.
-- 
Randolph