Help? AC_LIBOBJ. upgrade from 2.13

[Donald G Porter]

Trying to upgrade from the autoconf-2.13 conventions.  Read about
using AC_LIBOBJ to take care of constructing the LIBOBJS value.

Documentation at 

http://www.gnu.org/software/autoconf/manual/autoconf-2.57/html_node/autoconf_47.html

says:

"Macro: AC_LIBOBJ (function)
    Specify that `function.c' must be included in the executables to
    replace a missing or broken implementation of function.

    Technically, it adds `function.$ac_objext' to the output variable
    LIBOBJS ..."
    
Trouble is that it doesn't seem to do that.  In the substituted files,
I see @LIBOBJS@ replaced by `function$U.$ac_objext' and not 
`function.$ac_objext' as the documentation promised.

Reading further, I see that the extra $U is something that automake
users want.  But I don't want it.  How can I instruct autoconf not
to add the $U and instead follow its own documentation?
    
| Don Porter          Mathematical and Computational Sciences Division |
| address@hidden             Information Technology Laboratory |
| http://math.nist.gov/~DPorter/                                  NIST |
|______________________________________________________________________|