C complex vs. python complex

I need to wrap some functions that take C complex arguments
and return C complex results.  I got this to work using

  cdef extern from "complex.h":
      ctypedef struct c_complex "complex":
          pass
  
      cdef double creal(c_complex z)
      cdef double cimag(c_complex z)
  
  cdef extern from "myfile.h":
      cdef c_complex cplx(double r, double i)
  
cplx is actually the following macro:

  #define cplx(r,i) ((r)+I*(i))

Then my pyrex code uses creal and cimag to convert a C complex
variable to a python complex, and uses cplx to convert the other way.

But it would be much cleaner if pyrex did the conversion for me.
Is there a way to do this?

Thanks,

Dan