64 mred

 (require mred) package: gui-lib

The mred library is like scheme/gui/base, except that it provides variants of make-gui-namespace and make-gui-empty-namespace that attach mred instead of scheme/gui/base.

Both scheme/gui/base and racket/gui/base depend on mred, so it is attached by all variants of make-gui-empty-namespace.

 (require mred/mred) package: gui-lib

The mred library actually just re-exports mred/mred, which is an even older name for the library.