pub unsafe extern "C" fn gsl_fit_wlinear(
x: *const f64,
xstride: usize,
w: *const f64,
wstride: usize,
y: *const f64,
ystride: usize,
n: usize,
c0: *mut f64,
c1: *mut f64,
cov00: *mut f64,
cov01: *mut f64,
cov11: *mut f64,
chisq: *mut f64
) -> c_int
