Compilation problem

Clang doesn't compile with Debian libstdc++6-4.2-dev version 4.2.2-5.
This is because GCC 4.2 branch regressed on using iostream with no
RTTI and inline.

http://bugs.debian.org/459151

The change is already reverted for 4.2 in GCC (and for 4.3 __GXX_RTTI
was introduced to avoid the problem), and I expect Debian unstable to
have the fix soon.

In the mean time, I downgraded to 4.2.2-4. and there is no problem.