#1 strstream.h

Dear Sir,
I tryed and compiele UnderC under Debian Sarge. I Got
an error message strstream.h is missing. I try and
replaced your costume streams to cout(I know that
that doesn't make sens), but in the Main function I
need methods form strstream.h. How to get strstream?
I couldn't find a package.
Yours Sincerely and thanks
hawa