can \markup locate an embedded graphics file using include path?

[Graham King]

Many of my scores embed a small EPS file using (somewhat simplified):
>     \markup { \epsfile #X #10 #"path/to/file.eps" }
This is proving a bit of an obstacle to portability as path/to (relative or absolute) is installation-specific.

Is it possible to put file.eps (or the equivalent graphic in any other format) in the \include path?  Something like:
>     \markup { \epsfile #X #10 \include "file.eps" }
I've tried various formats and wrappers without success so far.