make a dynamic lib with configure, Makefile.in, /usr/bin/libtool?

make a dynamic lib with configure, Makefile.in, /usr/bin/libtool?

How can I make a dynamic lib with configure, Makefile.in, /usr/bin/libtool ? I want to edit an old configure that does /bin/sh .../libtool . Something like
configure LIBTOOL='/usr/bin/libtool -dynamic'
would be nice, but doesn't work; config.log --
configure:14291: creating libtool
LIBTOOL='$(SHELL) $(top_builddir)/libtool'
then the created libtool (7k lines sh ...) loses me.
This is on osx 10.8.3
which has no autoconf nor automake ?