It uses the reflex plateform.
nix-build -A ghc.skeleton
./result/bin/run-skeleton
nix-shell -A shells.ghc
cabal new-repl
And then run main. Depending on your useWarp setting, open your browser or directly use the desktop apps.
Note: you may need to remove the ghc.environment file which breaks everything.
RunSkeleton.hs is modified from the GTK implementation; this file and the other Nix files are based on guibou's reflex branch.