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As Panther default shell is bash or if you are using sh or zsh:

Launch Terminal. You'll find it in /Applications/Utilities

.profile

• At the terminal prompt, to open the text editor pico and create a file named .profile,
  execute the following command typing (or copy/paste):

  pico .profile

• Press Return, when the text editor open, type (or copy/paste):

  source /sw/bin/init.sh

at the end of the line press Return once.

• Then press Control-O, Return, and Control-X
  to save the file and return to the prompt.

.bashrc

• Create a file named .bashrc typing (or copy/paste):

  pico .bashrc

• Press Return, when the text editor open, type (or copy/paste):

  [[ -z $DISPLAY ]] && export DISPLAY=":0.0"

  . /sw/bin/init.sh

at the end of the line press Return once.

• Then press Control-O, Return, and Control-X
  to save the file and return to the prompt.