ctgsy2(3) on Linux
The text 1701ead5b8da, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
solve the generalized Sylvester equation A * R - L * B = scale * C (1) D * R - L * E = scale * F using Level 1 and 2 BLAS, where R and L are unknown M-by-N matrices,