PGASetFitnessCmaxValue(1) on Linux
The text 20a9f614d3f4, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny) shipped it. The page shows this text now.
The value of the multiplier used by PGAFitnessMinCmax so that the worst string has a nonzero fitness.