Dependant jlib requires new compiler

In file included from /usr/include/c++/4.9/atomic:38:0,
from /var/lib/jenkins/workspace/WSSQL-Candidate-6.0.0/CE/ubuntu-15.04-amd64/HPCC-Platform/system/jlib/jfile.ipp:25,
from /var/lib/jenkins/workspace/WSSQL-Candidate-6.0.0/CE/ubuntu-15.04-amd64/HPCC-Platform/system/jlib/jfile.cpp:51:
/usr/include/c+/4.9/bits/c0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C+ 2011 standard. This support is currently experimental, and must be enabled with the -std=c+11 or -std=gnu+11 compiler options.