Get the full pathname for a prog ?

[Yasunari Tosa]

AC_CHECK_PROG actually find the full pathname to the prog it is checking.

For example, I see in config.log that
configure:2825: checking for gcc
configure:2841: found /usr/bin/gcc

AC_CHECK_PROG has the following line:
   echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" 
>&AS_MESSAGE_LOG_FD

How can I keep the full pathname?   Is there a AC_ macro which does this?

Thank you.

--
Yasunari Tosa, Ph.D.               Email: address@hidden
NMR Ctr, Mass. General Hospital    TEL: 617-726-4050 
Building 149, 13th Street
Charlestown, MA 02129
USA