Allow v3 or v4 of log4cplus library for  unix platforms
Allow v3 or v4 of log4cplus library for  unix platforms


acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core,acmorrow/pion-core