Please remove fparser (source) from unstable. Binary packages are libfparser-
dev, libfparser-4.3, libfparser-4.3-dbg.
The Debian packages that depended on it now use the muparser library, and
fparser has become difficult to maintain with gcc-4.7. Upstream doesn't believe
in shared libraries, so we've been maintiaing that build system. It's gotten
too much to worry about for Wheezy, it's best to remove it for now.