The GHMM 0.7 release is very old, please use a svn checkout.
To check out the latest version from the Subversion repository follow the detailed instructions at http://sourceforge.net/svn/?group_id=67094. An anonymous checkout can simply be done by
NOTE: Since we have discontinued active development of the C++ bindings for the time being, the C++ sources are NOT part of the releases since 0.7.