Focal 1.0.5a tarball includes source and executable.
focal directory contains sample focal programs.
focal-1.0.5a directory contains the source and executable for Coherent-4.2.14.
untar then cd to new directory focal then cd to focal-1.0.5a
$ su
# make install
# exit
$
To rebuild fresh do:
$ make coherent
$ su
# make install
# exit
Then type "focal" to execute.
To try an example:
$cd
$cd focal/focal
$focal calndr.foc
=== program runs ===
*q <== exit focal
$