I'm trying to build numpy on win64 with msvc9 dynamically linked to mkl_rt.

It seems to be finding the libraries fine but the build fails with the following error

numpy\core\src\npymath\npy_math_private.h(171) : fatal error C1083: Cannot open include file: 'complex.h': No such file or directory


Am I missing something from my site.cfg or otherwise doing something dumb?

Thanks,
Dave