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diff --git a/m4/ax_check_openssl.m4 b/m4/ax_check_openssl.m4
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+# SPDX-License-Identifier: FSFAP
+#
+# ===========================================================================
+# https://www.gnu.org/software/autoconf-archive/ax_check_openssl.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# AX_CHECK_OPENSSL([action-if-found[, action-if-not-found]])
+#
+# DESCRIPTION
+#
+# Look for OpenSSL in a number of default spots, or in a user-selected
+# spot (via --with-openssl). Sets
+#
+# OPENSSL_CFLAGS to the include directives required
+# OPENSSL_LIBS to the -l directives required
+#
+# and calls ACTION-IF-FOUND or ACTION-IF-NOT-FOUND appropriately
+#
+# This macro sets OPENSSL_CFLAGS such that source files should use the
+# openssl/ directory in include directives:
+#
+# #include <openssl/hmac.h>
+#
+# LICENSE
+#
+# Copyright (c) 2009,2010 Zmanda Inc. <http://www.zmanda.com/>
+# Copyright (c) 2009,2010 Dustin J. Mitchell <dustin@zmanda.com>
+#
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice
+# and this notice are preserved. This file is offered as-is, without any
+# warranty.
+
+#serial 10
+
+AU_ALIAS([CHECK_SSL], [AX_CHECK_OPENSSL])
+AC_DEFUN([AX_CHECK_OPENSSL], [
+ found=false
+ default_ssldirs="/usr/local/ssl /usr/lib/ssl /usr/ssl /usr/pkg /usr/local /opt/local /usr/local/opt/openssl /usr/local/opt/libressl /usr"
+ AC_ARG_WITH([openssl],
+ [AS_HELP_STRING([--with-openssl=DIR],
+ [root of the OpenSSL directory])],
+ [
+ AS_CASE([$with_openssl],
+ [""|y|ye|yes],[ssldirs="$default_ssldirs"],
+ [n|no],[AC_MSG_ERROR([Invalid --with-openssl value])],
+ [*],[ssldirs="$withval"],
+ [ssldirs="$default_ssldirs"]
+ )
+ ], [
+ # if pkg-config is installed and openssl has installed a .pc file,
+ # then use that information and don't search ssldirs
+ PKG_CHECK_MODULES([OPENSSL], [crypto],
+ [found=true],
+ [ssldirs="$default_ssldirs"])
+
+ ]
+ )
+
+
+ # note that we #include <openssl/foo.h>, so the OpenSSL headers have to be in
+ # an 'openssl' subdirectory
+
+ AS_IF([! $found],[
+ OPENSSL_CFLAGS=
+ for ssldir in $ssldirs; do
+ AC_MSG_CHECKING([for openssl/ssl.h in $ssldir])
+ AS_IF([test -f "$ssldir/include/openssl/ssl.h"],
+ [
+ OPENSSL_CFLAGS="-I$ssldir/include"
+ OPENSSL_LIBS="-L$ssldir/lib -lssl -lcrypto"
+ found=true
+ AC_MSG_RESULT([yes])
+ break
+ ],
+ [
+ AC_MSG_RESULT([no])
+ ])
+ done
+
+ # if the file wasn't found, well, go ahead and try the link anyway -- maybe
+ # it will just work!
+ ])
+
+ # try the preprocessor and linker with our new flags,
+ # being careful not to pollute the global LIBS, LDFLAGS, and CPPFLAGS
+
+ AC_MSG_CHECKING([whether compiling and linking against OpenSSL works])
+ # AC_MSG_NOTICE([Trying link with OPENSSL_LIBS=$OPENSSL_LIBS; OPENSSL_CFLAGS=$OPENSSL_CFLAGS])
+
+ save_LIBS="$LIBS"
+ save_CPPFLAGS="$CPPFLAGS"
+ LIBS="$OPENSSL_LIBS $LIBS"
+ CPPFLAGS="$OPENSSL_CFLAGS $CPPFLAGS"
+ AC_LINK_IFELSE(
+ [AC_LANG_PROGRAM(
+ [
+ #include <openssl/crypto.h>
+ ],
+ [
+ OPENSSL_free(NULL);
+ ])],
+ [
+ AC_MSG_RESULT([yes])
+ $1
+ ], [
+ AC_MSG_RESULT([no])
+ $2
+ ])
+ CPPFLAGS="$save_CPPFLAGS"
+ LIBS="$save_LIBS"
+
+ AC_SUBST([OPENSSL_CFLAGS])
+ AC_SUBST([OPENSSL_LIBS])
+])