You may have to recompile CLHEP.
To download clhep type:
svn co svn://svn.freehep.org/svn/sandbox/clhep
now you need the source distribution of clhep from http://proj-clhep.web.cern.ch/proj-clhep/INSTALLATION/clhep-1.9.html.
Unpack this in clhep/source, then type:
cd source/<VERSION>/CLHEP configure --prefix=<yourclhepworkdir>/<platform> make make install
where platform is one of "ppc-MacOSX-g++", "i386-Linux-g++" or "x86-Windows-msvc".
Now copy the include directory
cp -r <platform>/include .
You can install the specific version for your platform by typing:
make windows make windows-install or make linux make linux-install or make macosx make macosx-install