0) create directory ~/bin and place it in your path
  mkdir $HOME/bin
  export PATH=$HOME/bin:$PATH #(bash) Place this line in your ~/.bashrc
  setenv PATH $HOME/bin:$PATH #(tcsh) Place this line in your ~/.cshrc

0.5) obtain two xplor-nih .tar.gz files, a -db file and an
     architecture-specific file (here, it's the 32-bit Mac version).

1) install Xplor-NIH:

  zcat xplor-nih-2.35-db.tar.gz | tar xf -
  zcat xplor-nih-2.35-Darwin_8_x86.tar.gz | tar xf -
  cd xplor-nih-2.35
  ./configure -symlinks $HOME/bin
  # bin/testDist

2) install VMD-XPLOR

  zcat vmd-xplor-1.7.2-Darwin_8_x86.tar.gz | tar xf -
  cd  vmd-xplor-1.7.2-Darwin_8_x86/
  ./configure -include_extra_libs
  ln -s `pwd`/vmd-xplor ~/bin

