Build errors on debian 7.8 about atomspace HOT 4 CLOSED

If I use gcc 4.9.2 I get this instead:

gareth@sexy:~/atomspace/trunk/build$ make
[ 3%] Built target json_spirit
[ 4%] Built target opencog_atom_types
[ 5%] Building CXX object opencog/atomutils/CMakeFiles/atomutils.dir/AtomUtils.cc.o
/home/gareth/atomspace/trunk/opencog/atomutils/AtomUtils.cc: In function ‘opencog::UnorderedHandleSet opencog::get_outgoing_nodes(const opencog::Handle&, const std::vector&)’:
/home/gareth/atomspace/trunk/opencog/atomutils/AtomUtils.cc:135:25: error: converting to ‘opencog::UnorderedHandleSet {aka std::unordered_set<opencog::Handle, opencog::handle_hash>}’ from initializer list would use explicit constructor ‘std::unordered_set<_Value, _Hash, _Pred, _Alloc>::unordered_set(std::unordered_set<_Value, _Hash, _Pred, _Alloc>::size_type, const hasher&, const key_equal&, const allocator_type&) [with _Value = opencog::Handle; _Hash = opencog::handle_hash; _Pred = std::equal_toopencog::Handle; _Alloc = std::allocatoropencog::Handle; std::unordered_set<_Value, _Hash, _Pred, _Alloc>::size_type = long unsigned int; std::unordered_set<_Value, _Hash, _Pred, _Alloc>::hasher = opencog::handle_hash; std::unordered_set<_Value, _Hash, _Pred, _Alloc>::key_equal = std::equal_toopencog::Handle; std::unordered_set<_Value, _Hash, _Pred, _Alloc>::allocator_type = std::allocatoropencog::Handle]’
return {};
^
make[2]: *** [opencog/atomutils/CMakeFiles/atomutils.dir/AtomUtils.cc.o] Error 1
make[1]: *** [opencog/atomutils/CMakeFiles/atomutils.dir/all] Error 2
make: *** [all] Error 2

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Ahh, OK, so thread_local is a c++11 feature, and you need gcc-4.8 or newer to get that. I'm not going to try to make it backwards-compat with gcc-4.7

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The gcc-4.9 bug is .. bizarre. I just worked around it in a new push, just now.

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And it builds now, might make sense to list minimal gcc version in the README

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