pub unsafe extern "C" fn dlanv2_(
a: *mut c_double,
b: *mut c_double,
c: *mut c_double,
d: *mut c_double,
rt1r: *mut c_double,
rt1i: *mut c_double,
rt2r: *mut c_double,
rt2i: *mut c_double,
cs: *mut c_double,
sn: *mut c_double,
)