dpptrs(3) on Linux
The text bb842b73b43f, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
solve a system of linear equations A*X = B with a symmetric positive definite matrix A in packed storage using the Cholesky factorization A = U**T*U or A = L*L**T computed by DPPTRF