dptsvx(3) on Linux
The text 74876c1bc41c, as Debian 3.1 (Sarge) 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