Install tmux on OSX WITHOUT brew

install_tmux_osx_no_brew

# Create a directory
mkdir ~/tmux-install
cd ~/tmux-install

# Get the files
curl -OL https://github.com/tmux/tmux/releases/download/2.3/tmux-2.3.tar.gz
curl -OL https://github.com/libevent/libevent/releases/download/release-2.0.22-stable/libevent-2.0.22-stable.tar.gz

# Extract them 
tar xzf tmux-2.3.tar.gz
tar xzf libevent-2.0.22-stable.tar.gz

# Compile libevent
cd libevent-2.0.22-stable
./configure --prefix=/opt
make
sudo make install

# Compile tmux
cd ../tmux-2.3
LDFLAGS="-L/opt/lib" CPPFLAGS="-I/opt/include" LIBS="-lresolv" ./configure --prefix=/opt
make
sudo make install

# Link it
ln -s /opt/bin/tmux /usr/local/bin/tmux

This works great, thanks!
I needed a sudo to create the symbolic link in the last part, and the openssl headers were missing on my system (got them from the source and copied to /usr/local/include, I'm running El Capitan).

LDFLAGS="-L/usr/local/opt/openssl/lib" CPPFLAGS="-I/usr/local/opt/openssl/include" ./configure --prefix=/opt

Making install in sample
make[3]: Nothing to be done for `install-exec-am'.
make[3]: Nothing to be done for `install-data-am'.
Making install in test
/Library/Developer/CommandLineTools/usr/bin/make  install-am
make[4]: Nothing to be done for `install-exec-am'.
make[4]: Nothing to be done for `install-data-am'.

Hello ,
I am getting this while running ls command of tmux
$ tmux ls
error connecting to /private/tmp/tmux-1368511905/default (No such file or directory)