As discussed in the SAT call 2014-08-19
The problem is alerting stack users to potentially missing assumed third party dependancies. (The example was DS9). Robert The Good said he had a config-time checker that he could ressurect to check for third-party dependancies.
The configure stuff is in
but may be/probably is very out of date.
I'll have a look at it and (a) add DS9 check (b) check with Dick in case he needs to document any extra steps.