>> unfortunately, just because one of those headers _exists_ doesn't
>> mean that [the build should be attempted].
>> This becomes a serious problem when building distributions [...]

> Sigh.  I tried to think of all the good reasons for not doing this
> before submitting a pr, but I didn't think of building distributions.

How about X being an add-on, and as such being in an unpredictable
place?  I certainly know on _my_ system X ain't going under
/usr/anything.

> Certainly this would work for building on your own machine.

Only if you're willing to dump add-on stuff in system directories.
I for one am not.

					der Mouse

			    mouse@collatz.mcrcim.mcgill.edu