Problem building libusb (C++)

Hi,

I included the full gcc in my target an now
I have libstdc++ and the C++ headers, but
the build of libusb continues to abort
because it doesn't find the C++ headers:

-----------------
i586-t2-linux-gnu-ar cru .libs/libusb.a  usb.o error.o descriptors.o linux.o
i586-t2-linux-gnu-ranlib .libs/libusb.a
creating libusb.la
(cd .libs && rm -f libusb.la && ln -s ../libusb.la libusb.la)
if /bin/sh ./libtool --mode=compile i586-t2-linux-gnu-g++ 
-DHAVE_CONFIG_H   -I.   -g -O2 -MT usbpp.lo -MD -MP -MF ".deps/usbp
p.Tpo" -c -o usbpp.lo usbpp.cpp; \
        then mv -f ".deps/usbpp.Tpo" ".deps/usbpp.Plo"; else rm -f 
".deps/usbpp.Tpo"; exit 1; fi
 i586-t2-linux-gnu-g++ -DHAVE_CONFIG_H -I. -g -O2 -MT usbpp.lo -MD -MP 
-MF .deps/usbpp.Tpo -c usbpp.cpp  -fPIC -DPIC -o .libs
/usbpp.o
usbpp.cpp:11:19: error: cstdlib: No such file or directory
usbpp.cpp:15:20: error: iostream: No such file or directory
In file included from usbpp.cpp:17:
usbpp.h:5:18: error: string: No such file or directory
usbpp.h:6:16: error: list: No such file or directory
----------------

but these headers are installed in:

 $root/usr/include/c++/4.1.2

Is there a way to force the inclusion of this path
in the build of libusb ?

Regards,
Claudio