"invalid command name"

I keep on getting these errors lately with various ports, not just these. Any idea? flomac:~ root# port build gnuplot Error: Error executing darwin_8: invalid command name "configure.cc" Error: Unable to execute port: Error evaluating variants flomac:~ root# port build hugs98 Error: Error executing darwin_8: invalid command name "configure.compiler" Error: Unable to open port: Error evaluating variants -- Florian Ebeling florian.ebeling@gmail.com