Building with libxml2

[JamesRamm]

Have added HAVE_LIBXML2 to the gyp file.
Error I'm getting is:

HAVE_LIBXML2 defined but compiling rapidxml_loader.cpp!

Extra configuration step needed?

[JamesRamm]

Manually removing rapidxml_loader.cpp from the source tree enabled mapnik to build correctly with libxml2.

Should the first line in rapidxml_loade.cpp:

#ifdef HAVE_LIBXML2
#error 
#endif

be changed to:

#ifndef HAVE_LIBXML2

     // rest of the file.....
#endif

??