https://codereview.appspot.com/561390043/diff/557260051/lily/include/score-engraver.hh File lily/include/score-engraver.hh (right):
https://codereview.appspot.com/561390043/diff/557260051/lily/include/score-engraver.hh#newcode26 lily/include/score-engraver.hh:26: #include <gc.h> This effectively adds a dependency on libgc which you should search for at configure - it is not necessarily installed in a default location. https://codereview.appspot.com/561390043/