Slightly related: can't seem to build the latest muse master.
Have you tried updating recently? Here's what I get, even on a fresh clone:
CMake Error at libraries/chain/CMakeLists.txt:30 (add_library):
Cannot find source file:
include/graphene/chain/hardfork.hpp
Tried extensions .c .C .c++ .cc .cpp .cxx .m .M .mm .h .hh .h++ .hm .hpp
.hxx .in .txx
Where to report this..I suppose the graphene repo, since the muse fork doesn't appear to have 'Issues' enabled?