pub unsafe extern fn dsyevd_(jobz: *const c_char,
uplo: *const c_char,
n: *const lapack_int,
a: *mut c_double,
lda: *const lapack_int,
w: *mut c_double,
work: *mut c_double,
lwork: *const lapack_int,
iwork: *mut lapack_int,
liwork: *const lapack_int,
info: *mut lapack_int)