dvips: ! Couldn't find header file pst-func.pro

[O. Hartmann]

I'm using port print/teTeX with PSTricks. Whenever I include
\usepackackage{pst-func} in the präambel/preamble and run dvips on the
text.dvi, I receive the error

dvips: ! Couldn't find header file pst-func.pro

Consulting Google tells me that this is supposed to be a bug long time
ago fixed by Herbert Voss.

What happens here?

regards,

Oliver 
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