This prevents girders from erasing landbacktex (square windows in tunnels and such), at the cost of requiring lfBasic and lfObject to be treated the same apart from graphically
As a special exception, FreeType can also be built with the 'makepp'
build tool, available from http://makepp.sourceforge.net.
Note, however. that you will need at least version 1.19 and pass the
option --norc-substitution to have it work correctly.