As of release 44849, GCC 4.7.0 (or higher) is now required to build ALLPATHS-LG.
We have made this transition in order to benefit from the many exciting new features afforded by the C++11 standard. If you are unable to access the latest versions of the compiler at this time, please continue to use earlier releases of ALLPATHS-LG which still support GCC 4.4.0 or higher.