Function ckgp_c 

pub unsafe extern "C" fn ckgp_c(
    inst: SpiceInt,
    sclkdp: SpiceDouble,
    tol: SpiceDouble,
    ref_: *const c_char,
    cmat: *mut [SpiceDouble; 3],
    clkout: *mut SpiceDouble,
    found: *mut SpiceBoolean,
)