sspgvx(3) on Linux
The text 376a2bd9172e, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
compute selected eigenvalues, and optionally, 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