--- autoconf-2.72/lib/autoconf/general.m4.orig	2023-12-25 17:50:44.269509270 +0100
+++ autoconf-2.72/lib/autoconf/general.m4	2023-12-25 17:51:39.592542892 +0100
@@ -2773,7 +2773,7 @@ AC_LANG_CONFTEST([AC_LANG_SOURCE([[$2]])
 AS_IF([dnl eval is necessary to expand ac_cpp.
 dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell.
 (eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
-dnl Quote $1 to prevent m4 from eating character classes
+dnl Quote first arg to prevent m4 from eating character classes
   $EGREP_TRADITIONAL "m4_bregexp([$1],[^[$-]],[.?])[$1]" >/dev/null 2>&1],
   [$3],
   [$4])