Can acinclude.m4 _override_ macros from elsewhere?

[Kevin P. Fleming]

I want to include a modified copy of one or two libtool-related macros 
in my source package. I have copied the relevant macros from 
/usr/share/aclocal/libtool.m4 into acinclude.m4, and made my changes.

However, aclocal puts the contents of acinclude.m4 into aclocal.m4 
_before_ macros from its own m4 files. This means that my changes are 
not used, since the macros are redefined to their standard contents 
later in aclocal.m4.

Is there a way around this?