pub unsafe extern "C" fn proj_create_conversion_pole_rotation_grib_convention(
    ctx: *mut PJ_CONTEXT,
    south_pole_lat_in_unrotated_crs: f64,
    south_pole_long_in_unrotated_crs: f64,
    axis_rotation: f64,
    ang_unit_name: *const c_char,
    ang_unit_conv_factor: f64,
) -> *mut PJ