When I tried to compile Xerces-C++ Version 2.6.0 from source on Mac OS X Tiger 10.4.2 with gcc-4.0.0 the compiler complained:
MacOSUnicodeConverter.cpp:78: error: 'static' may not be used when defining (as opposed to declaring) a static data member MacOSUnicodeConverter.cpp:84: error: 'static' may not be used when defining (as opposed to declaring) a static data member make: *** [MacOSUnicodeConverter.o] Error 1 make: *** [transcoders] Error 2 make: *** [Util] Error 2
The solution is easy, just delete the word static in the source code manually and build again or use this patch:
Download the Xerces-C++ source distribution from .
The sources contained in my case version 2.6.0.
Extract sources and apply patch:
tar xzf xerces-c-current.tar.gz cd xerces-c-src_2_6_0 patch -p1 <../xerces-c-src_2_6_0-tiger.diff
Please make sure that the paths are adjusted to your system. Follow the official build instructions Building Xerces-C++ from the Mac OS X command line at  afterwards.