Help needed for #871234 FTBFS with GCC-7: error: type/value mismatch

[Alex Mestiashvili <mailatgoogl@gmail.com>]

Any help is greatly appreciated,
here it the gcc's complain:

In file included from gff.h:12:0,
                 from gtf_tracking.h:12,
                 from bundles.h:22,
                 from replicates.h:10,
                 from common.cpp:28:
GHash.hh: In member function 'GHash<OBJ>::GHashEntry*
GHash<OBJ>::NextEntry()':
GHash.hh:91:44: error: type/value mismatch at argument 1 in template
parameter list for 'template<class _Tp> struct std::hash'
     while (pos<fCapacity && hash[pos].hash<0) pos++;

Thanks,
Alex