mp term missing in gnuplot 6.0?

[Allin C. <cot...@wf...>]

I just built gnuplot 6.0 on Linux, passing --with-metapost to 
configure. In the output from configure I see "metapost : yes", but 
on running the program after "make install" there's no mp terminal 
available:

gnuplot> set term mp

Terminal type is now 'unknown'

-- 
Allin Cottrell
Professor Emeritus
Wake Forest University