[Restricted to Autoconf, this is not something that matters to Libtool
and Automake]

Maybe I overlooked something, but don't you simply face the fact that
you used $( ) to dereference a shell variable?  That should not work.
Since you want it to work with Make too, I'd suggest ${ }.

BTW, using top_srcdir doesn't seem right, top_builddir does.

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