chegv(3) on Linux
The text 30ba9b9b18c7, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
compute all the eigenvalues, and optionally, the eigenvectors of a complex generalized Hermitian-definite eigenproblem, of the form A*x=(lambda)*B*x, A*Bx=(lambda)*x, or B*A*x=(lambda)*x