I haven't been around on steemit lately, but i'll try to post a new, updated tutorial.
What i suspect is happening is you're downloading boost_1_57_0.tar.bz2 and extracting it to boost_1_57_0 but then setting the BOOST_ROOT variable to boost_1_60_0. If you could try to correct that to match the name of the archive you're extracting it should work.