cunmr2(3) on Linux
The text 16ee63004e3d, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
overwrite the general complex m-by-n matrix C with Q * C if SIDE = 'L' and TRANS = 'N', or Q'* C if SIDE = 'L' and TRANS = 'C', or C * Q if SIDE = 'R' and TRANS = 'N', or C * Q' if SIDE = 'R' and TRANS = 'C',