pub unsafe extern fn dsygvx_(itype: *const lapack_int,
jobz: *const c_char,
range: *const c_char,
uplo: *const c_char,
n: *const lapack_int,
a: *mut c_double,
lda: *const lapack_int,
b: *mut c_double,
ldb: *const lapack_int,
vl: *const c_double,
vu: *const c_double,
il: *const lapack_int,
iu: *const lapack_int,
abstol: *const c_double,
m: *mut lapack_int,
w: *mut c_double,
z: *mut c_double,
ldz: *const lapack_int,
work: *mut c_double,
lwork: *const lapack_int,
iwork: *mut lapack_int,
ifail: *mut lapack_int,
info: *mut lapack_int)