Installing ns-2.35 on Mountain Lion, Mavericks, Yosemite and El Capitan (OS X 10.8/10.9/10.10/10.11)
  Here i will provide step by step procedure for you to install ns-2.35 on mac OS X 10.8/9/10 which i successfully installed on my mac (fully tested by me and its working)   Credits:-      Brain Adamson(for great patch)   Henrique Zelak Leite Bastos for the right help.  APPLE for Mac OS X.(the best a dev. can get)   Step 1. Software Requirements (Pre-requisites).     Download ns-2.35 from  http://sourceforge.net/projects/nsnam/files/allinone/ns-allinone-2.35/ns-allinone-2.35.tar.gz/download    Go through this tutorial to install command line tools via terminal  http://leviathan37.tumblr.com/post/76618063571/how-to-install-command-line-tools-on-osx-mavericks    Download XQuartz from http://xquartz.macosforge.org/  (this installs X11 libraries)  install and reboot/logout .   Step 2 . Choose install directory.     Place the downloaded ns-allione-2.35.tar.gz file in the location you want to install it.    Step 3 . Extract ns files.    Go to location where you h...