- presence of boost log library is autoetected;
- on g++ 4.4, boost library needs simple patch below [1];
- on g++ 4.4, need some rvalue and operator<< hacks (see #if);
- new log-filter config in global which can be set by snmp [2]

[1]
Change at make_shared.hpp:168
    ::new( pv ) T( boost::detail::sp_forward<Arg1>( arg1 ), boost::detail::sp_forward<Args>( args )... );
to
    ::new( pv ) T( std::forward<Arg1>( arg1 ), std::forward<Args>( args )... );

[2]
do a flexisip --dump-snmp-mib then
snmpset -m FLEXISIP-MIB -Of  -v 2c -c private localhost flexisipMIB.flexisip.global.logFilter.0 s "%Severity% >= debug"
snmpset -m FLEXISIP-MIB -Of  -v 2c -c private localhost flexisipMIB.flexisip.global.logFilter.0 s "%Severity% >= info"