READ THIS if you are trying to use Fademo (GEM Host Simulator) on any platform

CentOS7

• must create a symbolic link libexpat.so.0 -> /usr/lib/libexpat.so.1.6.0 as fademo references to libexpat.so.0. Note that in previous versions of CentOS, this link may point out to an older version of libexpat (e.g libexpat.so.1.5.0 in CentOS 6.2) libexpat but that's fine. it works.
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