pub unsafe extern fn dsgesv_(n: *const lapack_int,
nrhs: *const lapack_int,
a: *mut c_double,
lda: *const lapack_int,
ipiv: *mut lapack_int,
b: *const c_double,
ldb: *const lapack_int,
x: *mut c_double,
ldx: *const lapack_int,
work: *mut c_double,
swork: *mut c_float,
iter: *mut lapack_int,
info: *mut lapack_int)