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User-Agent: Mozilla/5.0 Galeon/1.2.5 (X11; Linux i686; U;) Gecko/20020610
Debian/1.2.5-1

Description of problem:
When $PATH isn't expanded, autoconf generates as the following:
  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR 
for as_dir in $PATH:/usr/lib:/usr/sbin  
do 
  IFS=$as_save_IFS 
  test -z "$as_dir" && as_dir=. 
  for ac_exec_ext in '' $ac_executable_extensions; do 
  if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then 
    ac_cv_path_SENDMAIL="$as_dir/$ac_word$ac_exec_ext" 
    echo "$as_me:$LINENO: found 
$as_dir/$ac_word$ac_exec_ext" >&5 
    break 2 
  fi 
done 
done 

but bash's man page is described about IFS:
       IFS    The  Internal Field Separator that is used for word
              splitting after expansion and to split  lines  into
              words  with  the read builtin command.  The default
              value is ``<space><tab><newline>''.

So IFS doesn't work for 'for'. I think AC_PATH_PROG's 4th argument always needs
to be set as the variable. I mean the above script needs  to be generated as the
following:
ac_dummy="$PATH:/usr/lib:/usr/sbin"
for as_dir in $ac_dummy

or

for as_dir in $($PATH:/usr/lib:/usr/sbin)


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1.runs autoconf with attached configure.in
2.runs configure without /usr/sbin in PATH
3.
	

Actual Results:  program doesn't found.

Expected Results:  program should found.

Additional info: