sptsvx(3) on Linux
The text 1c971061f9d8, as Debian 3.0 (Woody) shipped it.
use the factorization A = L*D*L**T to compute the solution to a real system of linear equations A*X = B, where A is an N-by-N symmetric positive definite tridiagonal matrix and X and B are N-by-NRHS matrices