>>>...or will i need to run windows AutoCAD lt in bootcamp ...<<<<
If you are in an office and you don't like to be different,unique and have everything especially done for you alone, or you do it all yourself, then that's an option you need to decide on.

Otherwise on a MAC you will need to create your own access to those library blocks as noted by @maxim_k above. Most MAC users have no problem going it alone so to speak, it's why you are on that platform after all.