pub unsafe extern fn dtgevc_(side: *const c_char,
howmny: *const c_char,
select: *const lapack_logical,
n: *const lapack_int,
s: *const c_double,
lds: *const lapack_int,
p: *const c_double,
ldp: *const lapack_int,
vl: *mut c_double,
ldvl: *const lapack_int,
vr: *mut c_double,
ldvr: *const lapack_int,
mm: *const lapack_int,
m: *mut lapack_int,
work: *mut c_double,
info: *mut lapack_int)