add  how to install gcc 4.8
add  how to install gcc 4.8

herocodemaster/opencvr,xsmart/opencvr,xiaojuntong/opencvr,telecamera/opencvr,xsmart/opencvr,veyesys/opencvr,xiaojuntong/opencvr,herocodemaster/opencvr,xsmart/opencvr,herocodemaster/opencvr,xsmart/opencvr,veyesys/opencvr,veyesys/opencvr,xiaojuntong/opencvr,telecamera/opencvr,herocodemaster/opencvr,veyesys/opencvr,telecamera/opencvr,xiaojuntong/opencvr,xsmart/opencvr,veyesys/opencvr,telecamera/opencvr