Comment 7 for bug 1465709

What about VERSION-DISPLAY-STRING ?

And maybe you're right that compatible-p is a feature that no one intends to use anyway — the right thing if you're going to be incompatible is to change the system name, e.g. name your system FOO2 instead of FOO, which also allows the two things to coexist. Then, (SYSTEM-VERSION<= SYSTEM VERSION1 VERSION2) ?

Also, instead of (:VERSION MIN MAX), shouldn't it be (:VERSION START END) when the condition is

(AND (SYSTEM-VERSION<= START VERSION) (NOT SYSTEM-VERSION<= END VERSION))