1.  Get the sources from�http://www.gprolog.org/gprolog-1.4.3.tar.gz

2.  Uncompress it by double clicking file or from the terminal window using:

	� �tar xfz gprolog-1.4.3.tar.gz

3.  Go to src dir in the gprolog-1.4.3 folder by typing:  

	� �cd gprolog-1.4.3/src

You need to put in the whole path (/Users/username/.../
gprolog-1.4.3/src.  It helps to have a finder window open.

4.  Configure it by typing:

� �	  ./configure --prefix=/opt/local/

5.  Compile it by typing:

	� �make

6.  Install (you must have permissions) by typing:

	� �sudo make install

This installs gprolog in /opt/local with binaries in /opt/local/bin

(Also include, if you can, /opt/local/bin to your PATH variable, or
else add it in your .bash_profile file.)