The following problem was reported to the Debian BTS
(http://bugs.debian.org/456096):

Your package fails to build with GCC 4.3. Version 4.3 has not been released yet but I'm building with a snapshot in order to find errors and give people an advance warning. In GCC 4.3, the C++ header dependencies have been cleaned up. The advantage of this is that programs will compile faster. The downside is that you actually need to directly #include everything you use (but you really should do this anyway, otherwise your program won't work with any compiler other than GCC). There's some more information about this at http://www.cyrius.com/journal/2007/05/10#gcc-4.3-include

You can reproduce this problem with gcc-snapshot from unstable. Note that Red Hat, Novell and Ubuntu have done some work getting packages to build with GCC 4.3 so there might be patches floating around somewhere. I suggest you talk to your upstream.

Regards Racke