If you're having troubles running it, make sure you can reach your Chicken 5 install:
csi
CHICKEN
(c) 2008-2018, The CHICKEN Team
(c) 2000-2007, Felix L. Winkelmann
Version 5.0.0 (rev 12f2f2cc)
... buncha stuff ...
#;1> (display "Chicken is delicious!\n")
#;2> ,q
If not, figure out where it installed and add that to PATH, or just:
PATH=/usr/local/bin ./src/eldritch.scm