library name enforcement?

[Bob Proulx]

Older versions of automake allowed arbitrary library names.

  noinst_LIBRARIES = foo.a

Recent versions of automake now complain about this naming.

  Makefile.am:2: `foo.a' is not a standard library name

I would normally like the lib naming but in this case I am retrofiting
an existing project and others disagree.

I searched the documentation but I could find no way to revert to the
previous behavior.  Any hints?

Bob