ssygvd(3) on Linux
The text 41a730ff4815, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
compute all the eigenvalues, and optionally, the eigenvectors of a real generalized symmetric-definite eigenproblem, of the form A*x=(lambda)*B*x, A*Bx=(lambda)*x, or B*A*x=(lambda)*x