LGTM
https://codereview.appspot.com/547540043/diff/561380043/lily/main.cc File lily/main.cc (right): https://codereview.appspot.com/547540043/diff/561380043/lily/main.cc#newcode772 lily/main.cc:772: sane_putenv("GC_INITIAL_HEAP_SIZE", "40M", false); Do you think it makes sense to mention this environment variable in the lilypond documentation? Is there ever a reason for the user to change the value? https://codereview.appspot.com/547540043/
