Mingw32 will not compile current numpy due to initialization of a static structure slot with a Python C-API function. The function is not considered a constant expression by the old gcc in mingw32. Compilation does work with more recent compilers; evidently the meaning of "constant expression" is up to the vendor.
So, this is fixable if we initialize the slot with 0, but that loses some precision/functionality. The question is, do we want to support mingw32, and numpy-vendor as well, for numpy 1.10.0? I think the answer is probably "yes", but we may want to reconsider for numpy 1.11, when we may want to use Carl's mingw64 toolchain instead.