pub unsafe extern fn cgtcon_(norm: *const c_char,
n: *const lapack_int,
dl: *const lapack_complex_float,
d: *const lapack_complex_float,
du: *const lapack_complex_float,
du2: *const lapack_complex_float,
ipiv: *const lapack_int,
anorm: *const c_float,
rcond: *mut c_float,
work: *mut lapack_complex_float,
info: *mut lapack_int)