That is a bug
in some versions of libexpat1-dev package. Upgrade your expat library to a version atleast 1.95.6-3.
If you are a debian user, pick one
from the testing or unstable distribution (or use apt-get if you have configured your sources.list to contain testing/unstable).If not, you hopefully find your way to get newer version(or somebody else might help you).
In the other hand, if the upgrading of libraries doesn't seem cool, the bug is easy to fix by hand with help of the bug-report mentioned above