https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116400
--- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> ---
for ac_prog in gm4 gnum4 m4
do
# Extract the first word of "$ac_prog", so it can be a program name with
args.
set dummy $ac_prog; ac_word=$2
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
$as_echo_n "checking for $ac_word... " >&6; }
if ${ac_cv_prog_M4+:} false; then :
$as_echo_n "(cached) " >&6
else
if test -n "$M4"; then
ac_cv_prog_M4="$M4" # Let the user override the test.
else
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH
do
IFS=$as_save_IFS
test -z "$as_dir" && as_dir=.
for ac_exec_ext in '' $ac_executable_extensions; do
if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
ac_cv_prog_M4="$ac_prog"
$as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext"
>&5
break 2
fi
done
done
IFS=$as_save_IFS
fi
fi
M4=$ac_cv_prog_M4
if test -n "$M4"; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $M4" >&5
$as_echo "$M4" >&6; }
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
fi
test -n "$M4" && break
done
test -n "$M4" || M4="$MISSING m4"
case " $build_configdirs " in
*" m4 "*) M4='$$r/$(BUILD_SUBDIR)/m4/m4' ;;
esac
