fluxbox 0.9.14 build error

[jakub@ifmpan.poznan.pl]

Hi, I tried to build a debian source package with fluxbox with no luck. I
downloaded the package for debian testing, package version is 0.9.14. The
soul modyfication I've made to the source was adding "-mtune=athlon-xp"
CFLAG to <package>/debian/rules.

Aftef #dpkg-buildpackage -uc -b; it brakes with the following:

checking for strstream... no
configure: error: Your libstdc++ doesn't have the sstream or strstream
classes
make: *** [config.status] Error 1

I've searched google but found mostly some wingsdings in russian that I
can't read.
Thanks.
Jakub Narojczyk