Installing NASM,Eclipse and QEMU on Macbook Pro 2015 early

My development Environment
Macbook Pro 2015 early
OS X 10.11.1 El Capitan


I am studying to make Operating System. So I am downloading and installing programs.

It is a part of process. 

At first, Download and install Homebrew.  (It is easy tool to download and install programs)

$ ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

-How to install NASM

$brew install nasm

-How to install Eclipse

click download button on http://www.eclipse.org/ and

Eclipse IDE for C/C++ Developers 

-How to install Java Runtime Environment(JRE)

enter http://www.oracle.com/technetwork/java/index.html 

then, click downloads, Java Runtime Environment

-How to install QEMU

$brew install qemu 

how to launch

$qemu-system-x86_64