--- autoconf-2.72/tests/local.at.orig	2023-12-22 16:05:20.000000000 +0100
+++ autoconf-2.72/tests/local.at	2023-12-25 17:58:47.286892540 +0100
@@ -558,7 +558,7 @@ m4_define([AT_CHECK_CONFIGURE],
 #   Set by AC_OUTPUT.
 # - AC_SUBST'ed variables
 #   (FIXME: Generate a list of these automatically.)
-# - _|@|.[*#?$].|argv|ARGC|LINENO|OLDPWD|PIPESTATUS|RANDOM|SECONDS
+# - _|@|.[*#?$].|argv|ARGC|LINENO|OLDPWD|PIPESTATUS|RANDOM|SECONDS|BASHPID|EPOCHREALTIME|KSH_MATCH
 #   |SHLVL|START_TIME|ToD|_AST_FEATURES
 #   Some variables some shells use and change.
 #   '.[*#?$].' catches '$#' etc. which are displayed like this:
@@ -611,7 +611,7 @@ if test -f state-env.before && test -f s
       [EGREP_TRADITIONAL],
       [GREP|[EF]GREP|SED],
       [[_@]|.[*@%:@?$].],
-      [argv|ARGC|LINENO|BASH_ARGC|BASH_ARGV|OLDPWD|PIPESTATUS|RANDOM],
+      [argv|ARGC|LINENO|BASH_ARGC|BASH_ARGV|OLDPWD|PIPESTATUS|RANDOM|BASHPID|EPOCHREALTIME|KSH_MATCH],
       [SECONDS|SHLVL|START_TIME|ToD|_AST_FEATURES]))=' \
      $act_file ||
        test $? -eq 1 || echo failed >&2
@@ -641,7 +641,7 @@ fi
 # - Variables with unstable values in at least some shells:
 #   - OLDPWD [bash, zsh]
 #   - PPID [bash, zsh]
-#   - RANDOM [bash, zsh]
+#   - RANDOM [bash, zsh, mksh]
 #   - SECONDS [bash, zsh]
 #   - SHLVL [bash]
 #   - START_TIME [NetBSD sh]
@@ -653,6 +653,9 @@ fi
 #   - BASH_ARGV [bash]
 #   - LINENO [Posix]
 #   - _AST_FEATURES [ksh93]
+#   - BASHPID [bash, mksh]
+#   - EPOCHREALTIME [zsh, mksh]
+#   - KSH_MATCH [mksh]
 # - Optionally, variables that are expected to vary in a particular test.
 #   This is controlled by the EXTRA-VARIANCE argument, which is a
 #   whitespace-separated sequence of tokens.  Each token means to ignore
@@ -692,6 +695,9 @@ do
 	/^PPID=/ d
 	/^RANDOM=/ d
 	/^SECONDS=/ d
+	/^BASHPID=/ d
+	/^EPOCHREALTIME=/ d
+	/^KSH_MATCH=/ d
 	/^SHLVL=/ d
 	/^START_TIME=/ d
 	/^ToD=/ d