So, first, use pprof tool from github.com/google/pprof. It is much better.

Second, those "missing" dylibs are actually missing. Kinda. OSX now has some sort of linker cache or something and a number of system libraries are there. So pprof won't be able to symbolize addresses inside those. But in many cases it is harmless. New pprof will still plot something like [libiconv.2.dylib] in place of actual functions if you have them in profile.