Alternative to configure substitution in _SOURCES

[Murray Cumming]

With automake 1.5, when I use a configure variable in the list of
sources in a Makefile.am here:
http://cvs.gnome.org/lxr/source/gtkmm-root/gtk-build/Makefile.am#32

I get this error:

gtk/gtkmm/Makefile.am:32: libgtkmm_la_SOURCES includes configure
substitution address@hidden@

and the list of files is not added to libgtkmm_la_SOURCES.

However, we need to use the same list of sources in several Makefile.am
files, and we would like to generate that list automatically based on
file extensions. So what is the best way to do this?

-- 
Murray Cumming
address@hidden
www.murrayc.com