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