Unable to build C++ bindings for ncurses 5.4

[Ari Pollak]

I'm attempting to build ncurses 5.4 under Solaris 9 with gcc/g++ 3.2.3 and C++
bindings for ncurses enabled. But it fails when compiling, it seems that it
doesn't like Solaris' libc:

make: Entering directory `/proj/crew/ari/build/ncurses-5.4/c++'
/arch/gnu/bin/g++ -I../c++ -I../include -I. -DHAVE_CONFIG_H -I. -I../include 
-D__EXTENSIONS__ -DNDEBUG -I/arch/gnu/packages/ncurses-5.4/include/ncurses -O2
-c ../c++/cursesw.cc -o ../objects/cursesw.o
../c++/cursesw.cc: In member function `int NCursesWindow::scanw(const char*, 
   ...)':
../c++/cursesw.cc:64: `::vsscanf' undeclared (first use here)
make: *** [../objects/cursesw.o] Error 1
make: Leaving directory `/proj/crew/ari/build/ncurses-5.4/c++'