How does one declare non-lisp dependencies?

[Ian Tegebo]

While quickloading IOLib, g++ raised an error because it couldn't find
"lfp.h".  After digging around a bit, I realized I needed to install
libfixposix.  It seems like ASDF would already have a way to express this
dependency, resulting in a clearer error message.

If this doesn't already exist, what's the way to go about it?  A :before
method on prepare-op for cffi components (or some such, I'm just bluffing
here)?

-- 
Ian Tegebo
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