Comment #3 on issue 1746 by [email protected]: v2.13.48 docball adds offline-root/ directory
http://code.google.com/p/lilypond/issues/detail?id=1746
From inspection of Lily source history with gitk, a good candidate is c58b9bd118958423656e674c25d940cdec71f58a http://git.savannah.gnu.org/gitweb/?p=lilypond.git;a=commitdiff;h=c58b9bd118958423656e674c25d940cdec71f58a See the change in rsync invocation in GNUmakefile.in.
