How to handle data/script files in a VPATH build ?

[Sylvestre Ledru]

Hello,

I am trying to enable the VPATH path build of a software.

The whole compilation process is fine but I am stuck at the end of the
process.
I need to call a script to finish the build process. This script will be
run against data files.

In my Makefile.am, I have: 
all-local: macros
macros: $(top_builddir)/bin/myscript
        $(top_builddir)/bin/myscript $(top_builddir)/dataDir/myData.sci

Obviously, this works when I am building my application in the source
tree but it fails when building as VPATH.

I cannot change top_builddir by top_srcdir since I need both the data
and script to be available in the build tree.

Is there a trick here ? (besides adding specific install target for the
VPATH case for each SUBDIRS).

Thanks
Sylvestre