Update mac/linux build instructions.
Update mac/linux build instructions.

ligzy/thor,UIKit0/thor,yue9944882/thor,Conan-Kudo/thor,volvet/thor,nvoron23/thor,nikai3d/thor,mcanthony/thor,awakecoding/thor,shyamalschandra/thor,mbebenita/thor,bheng4/thor,guiquanz/thor,yue9944882/thor,volvet/thor,volvet/thor,bheng4/thor,shaunstanislaus/thor,tmatth/thor,rammybt/thor,JoKit/thor,tdaede/thor,xkfz007/thor,mcanthony/thor,xkfz007/thor,awakecoding/thor,cisco/thor,rammybt/thor,tmatth/thor,ligzy/thor,Conan-Kudo/thor,JoKit/thor,stamhe/thor,nikai3d/thor,stamhe/thor,cisco/thor,mbebenita/thor,nvoron23/thor,cisco/thor,yue9944882/thor,tmatth/thor,UIKit0/thor,shaunstanislaus/thor,supasate/thor,guiquanz/thor,tdaede/thor,shyamalschandra/thor,supasate/thor