[julia-users] Gadfly installation problem... ERROR: DenseArray not defined

[Ivar Nesje]

It seems like you are using the 0.2.0 version of Julia, and some package 
authors have not correctly marked new versions of their package to require 
0.3.0-prerelease when they decided to use features that has been introduced 
after the release of 0.2.0. The consequence is that Pkg.add and Pkg.update 
installs versions of some packages that is incompatible with your version of 
Julia. I think this is a very unfortunate situation for new people evaluating 
Julia, and the easiest way to solve this us to compile from source or download 
a nightly release.