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