complex(kind(1.d0)) function zlog10 (z)
      implicit none
c april 1977 version.  w. fullerton, c3, los alamos scientific lab.
      complex(kind(1.d0)) z
      real(kind(1.d0)) aloge
      data aloge / 0.4342944819 0325182765d0 /
c
      zlog10 = aloge * log(z)
c
      return
      end