apt: gcc g++ automake flex bison ruby1.9.1-dev llvm-dev zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev libncurses5-dev
yum: gcc gcc-c++ automake flex bison ruby-devel rubygems llvm-static llvm-devel zlib-devel libyaml-devel openssl-devel gdbm-devel readline-devel ncurses-devel
port: openssl readline libyaml gdbm
brew: openssl readline libyaml gdbm
pacman: gcc automake flex bison ruby llvm35 zlib libyaml openssl gdbm readline ncurses

apt: gcc g++ automake flex bison ruby1.9.1-dev llvm-dev libedit-dev zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev libncurses5-dev
yum: gcc gcc-c++ automake flex bison ruby-devel rubygems llvm-static llvm-devel
libedit-devel zlib-devel libyaml-devel openssl-devel gdbm-devel readline-devel ncurses-devel
port: openssl readline libyaml gdbm
brew: openssl readline libyaml gdbm
pacman: gcc automake flex bison ruby llvm35 libedit zlib libyaml openssl gdbm readline ncurses

Add libedit as a dependency for rbx.
Add libedit as a dependency for rbx.

* LLVM pulls in libedit, so the linker needs it.
* OS X already ships with libedit.
