10 files changed, 226 insertions, 383 deletions

diff --git a/m4/Makefile.am b/m4/Makefile.am
index d41788460..79010513f 100644
--- a/m4/Makefile.am
+++ b/m4/Makefile.am
@@ -21,7 +21,6 @@ inttypes-pri.m4\
 isc-posix.m4\
 lcmessage.m4\
 libgcrypt.m4\
-libgnurl.m4\
 libcurl.m4\
 lib-ld.m4\
 lib-link.m4\
diff --git a/m4/as-auto-alt.m4 b/m4/as-auto-alt.m4
index 3f7920dd2..07c550b38 100644
--- a/m4/as-auto-alt.m4
+++ b/m4/as-auto-alt.m4
@@ -10,7 +10,7 @@ AC_DEFUN([AS_AUTOTOOLS_ALTERNATE],
 [
   dnl allow for different autoconf version
   AC_ARG_WITH(autoconf,
-    AC_HELP_STRING([--with-autoconf],
+    AS_HELP_STRING([--with-autoconf],
                    [use a different autoconf for regeneration of Makefiles]),
     [
       unset AUTOCONF
@@ -20,7 +20,7 @@ AC_DEFUN([AS_AUTOTOOLS_ALTERNATE],
 
   dnl allow for different autoheader version
   AC_ARG_WITH(autoheader,
-    AC_HELP_STRING([--with-autoheader],
+    AS_HELP_STRING([--with-autoheader],
                    [use a different autoheader for regeneration of Makefiles]),
     [
       unset AUTOHEADER
@@ -30,7 +30,7 @@ AC_DEFUN([AS_AUTOTOOLS_ALTERNATE],
 
   dnl allow for different automake version
   AC_ARG_WITH(automake,
-    AC_HELP_STRING([--with-automake],
+    AS_HELP_STRING([--with-automake],
                    [use a different automake for regeneration of Makefiles]),
     [
       unset AUTOMAKE
@@ -40,7 +40,7 @@ AC_DEFUN([AS_AUTOTOOLS_ALTERNATE],
 
   dnl allow for different aclocal version
   AC_ARG_WITH(aclocal,
-    AC_HELP_STRING([--with-aclocal],
+    AS_HELP_STRING([--with-aclocal],
                    [use a different aclocal for regeneration of Makefiles]),
     [
       unset ACLOCAL
diff --git a/m4/check-latex-package.m4 b/m4/check-latex-package.m4
new file mode 100644
index 000000000..7b7861134
--- /dev/null
+++ b/m4/check-latex-package.m4
@@ -0,0 +1,42 @@
+dnl
+dnl CHECK_LATEX_PACKAGE(FEATURE-NAME,
+dnl                     PACKAGE-NAME,
+dnl                     ACTION-IF-FOUND,
+dnl                     ACTION-IF-NOT-FOUND)
+dnl
+dnl Tries to compile a small LaTeX document to see if the requested package is
+dnl available to be used with \usepackage.
+dnl
+dnl The result will be cached in the ac_cv_tex_PACKAGE-NAME variable.
+dnl
+dnl This macro also checks for pdflatex as in AC_CHECK_PROGS and the result
+dnl is made available in the PDFLATEX_BINARY variable (all capitals like that.)
+dnl
+dnl FEATURE-NAME is one or more words to identify the check;
+dnl PACKAGE-NAME is the package as it appears in the \usepackage statement
+dnl ACTION-IF-FOUND (optional) commands to execute if the package is installed
+dnl ACTION-IF-NOT-FOUND (optional) the inverse of ACTION-IF-FOUND
+dnl
+AC_DEFUN([CHECK_LATEX_PACKAGE],
+[AC_CHECK_PROGS([PDFLATEX_BINARY], [pdflatex], [no])
+
+ AS_IF([test "x$ac_cv_prog_PDFLATEX_BINARY" = "xno"],
+   [m4_if([$4], ,:,[$4])],
+   [AC_CACHE_CHECK([for the $1 package for LaTeX], [AS_TR_SH([ac_cv_tex_][$2])],
+      [cat <<EOF > conftest.tex
+\\documentclass{article}
+\\usepackage{$2}
+\\begin{document}
+Hello
+\\end{document}
+EOF
+
+       "$ac_cv_prog_PDFLATEX_BINARY" conftest.tex 1>/dev/null 2>&1
+       AS_IF([test "x$?" = "x0"],
+         [AS_VAR_SET([AS_TR_SH([ac_cv_tex_][$2])], [yes])],
+         [AS_VAR_SET([AS_TR_SH([ac_cv_tex_][$2])], [no])])])
+
+    AS_VAR_IF([AS_TR_SH([ac_cv_tex_][$2])], [xyes],
+      [m4_if([$3], ,:,[$3])],
+      [m4_if([$4], ,:,[$4])])])
+])dnl
diff --git a/m4/check-libheader.m4 b/m4/check-libheader.m4
index 1e24d8a97..4e0285336 100644
--- a/m4/check-libheader.m4
+++ b/m4/check-libheader.m4
@@ -11,30 +11,19 @@ dnl HEADER-NAME         - header file name as in AC_CHECK_HEADER
 dnl ACTION-IF-FOUND     - when feature is found then execute given action
 dnl ACTION-IF-NOT-FOUND - when feature is not found then execute given action
 dnl EXTRA-LDFLAGS       - extra linker flags (-L or -l)
-dnl EXTRA-CPPFLAGS      - extra C preprocessor flags, i.e. -I/usr/X11R6/include
+dnl EXTRA-CPPFLAGS      - extra C preprocessor flags, e.g. -I/usr/X11R6/include
 dnl
-dnl Based on GST_CHECK_LIBHEADER from gstreamer plugins 0.3.1.
 dnl
 AC_DEFUN([CHECK_LIBHEADER],
-[
-  AC_CHECK_LIB([$2], [$3], HAVE_[$1]=yes, HAVE_[$1]=no, [$7])
-  check_libheader_feature_name=translit([$1], A-Z, a-z)
-
-  if test "x$HAVE_[$1]" = "xyes"; then
-    check_libheader_save_CPPFLAGS=$CPPFLAGS
-    CPPFLAGS="[$8] $CPPFLAGS"
-    AC_CHECK_HEADER([$4], :, HAVE_[$1]=no)
-    CPPFLAGS=$check_libheader_save_CPPFLAGS
-  fi
-
-  if test "x$HAVE_[$1]" = "xyes"; then
-    ifelse([$5], , :, [$5])
-    AC_MSG_NOTICE($check_libheader_feature_name was found)
-  else
-    ifelse([$6], , :, [$6])
-    AC_MSG_WARN($check_libheader_feature_name not found)
-  fi
-  AC_SUBST(HAVE_[$1])
-]
-)
+[m4_if([$7], ,:,[LDFLAGS="$7 $LDFLAGS"])
+ m4_if([$8], ,:,[CPPFLAGS="$8 $CPPFLAGS"])
 
+ AC_CHECK_HEADERS([$4],
+   [AC_CHECK_LIB([$2], [$3],
+      [eval "HAVE_]AS_TR_SH([$1])[=yes"]
+       m4_if([$5], ,:,[$5]),
+      [eval "HAVE_]AS_TR_SH([$1])[=no"]
+       m4_if([$6], ,:,[$6]))],
+   [eval "HAVE_]AS_TR_SH([$1])[=no"]
+    m4_if([$6], ,:,[$6]))
+])dnl
diff --git a/m4/iconv.m4 b/m4/iconv.m4
index 41aa44a56..e593b7270 100644
--- a/m4/iconv.m4
+++ b/m4/iconv.m4
@@ -1,5 +1,6 @@
-# iconv.m4 serial 18 (gettext-0.18.2)
-dnl Copyright (C) 2000-2002, 2007-2013 Free Software Foundation, Inc.
+# iconv.m4 serial 21
+dnl Copyright (C) 2000-2002, 2007-2014, 2016-2020 Free Software Foundation,
+dnl Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -29,7 +30,7 @@ AC_DEFUN([AM_ICONV_LINK],
 
   dnl Add $INCICONV to CPPFLAGS before performing the following checks,
   dnl because if the user has installed libiconv and not disabled its use
-  dnl via --without-libiconv-prefix, they want to use it. The first
+  dnl via --without-libiconv-prefix, he wants to use it. The first
   dnl AC_LINK_IFELSE will then fail, the second AC_LINK_IFELSE will succeed.
   am_save_CPPFLAGS="$CPPFLAGS"
   AC_LIB_APPENDTOVAR([CPPFLAGS], [$INCICONV])
@@ -72,27 +73,33 @@ AC_DEFUN([AM_ICONV_LINK],
       if test $am_cv_lib_iconv = yes; then
         LIBS="$LIBS $LIBICONV"
       fi
-      AC_RUN_IFELSE(
-        [AC_LANG_SOURCE([[
+      am_cv_func_iconv_works=no
+      for ac_iconv_const in '' 'const'; do
+        AC_RUN_IFELSE(
+          [AC_LANG_PROGRAM(
+             [[
 #include <iconv.h>
 #include <string.h>
-int main ()
-{
-  int result = 0;
+
+#ifndef ICONV_CONST
+# define ICONV_CONST $ac_iconv_const
+#endif
+             ]],
+             [[int result = 0;
   /* Test against AIX 5.1 bug: Failures are not distinguishable from successful
      returns.  */
   {
     iconv_t cd_utf8_to_88591 = iconv_open ("ISO8859-1", "UTF-8");
     if (cd_utf8_to_88591 != (iconv_t)(-1))
       {
-        static const char input[] = "\342\202\254"; /* EURO SIGN */
+        static ICONV_CONST char input[] = "\342\202\254"; /* EURO SIGN */
         char buf[10];
-        const char *inptr = input;
+        ICONV_CONST char *inptr = input;
         size_t inbytesleft = strlen (input);
         char *outptr = buf;
         size_t outbytesleft = sizeof (buf);
         size_t res = iconv (cd_utf8_to_88591,
-                            (char **) &inptr, &inbytesleft,
+                            &inptr, &inbytesleft,
                             &outptr, &outbytesleft);
         if (res == 0)
           result |= 1;
@@ -105,14 +112,14 @@ int main ()
     iconv_t cd_ascii_to_88591 = iconv_open ("ISO8859-1", "646");
     if (cd_ascii_to_88591 != (iconv_t)(-1))
       {
-        static const char input[] = "\263";
+        static ICONV_CONST char input[] = "\263";
         char buf[10];
-        const char *inptr = input;
+        ICONV_CONST char *inptr = input;
         size_t inbytesleft = strlen (input);
         char *outptr = buf;
         size_t outbytesleft = sizeof (buf);
         size_t res = iconv (cd_ascii_to_88591,
-                            (char **) &inptr, &inbytesleft,
+                            &inptr, &inbytesleft,
                             &outptr, &outbytesleft);
         if (res == 0)
           result |= 2;
@@ -124,14 +131,14 @@ int main ()
     iconv_t cd_88591_to_utf8 = iconv_open ("UTF-8", "ISO-8859-1");
     if (cd_88591_to_utf8 != (iconv_t)(-1))
       {
-        static const char input[] = "\304";
+        static ICONV_CONST char input[] = "\304";
         static char buf[2] = { (char)0xDE, (char)0xAD };
-        const char *inptr = input;
+        ICONV_CONST char *inptr = input;
         size_t inbytesleft = 1;
         char *outptr = buf;
         size_t outbytesleft = 1;
         size_t res = iconv (cd_88591_to_utf8,
-                            (char **) &inptr, &inbytesleft,
+                            &inptr, &inbytesleft,
                             &outptr, &outbytesleft);
         if (res != (size_t)(-1) || outptr - buf > 1 || buf[1] != (char)0xAD)
           result |= 4;
@@ -144,14 +151,14 @@ int main ()
     iconv_t cd_88591_to_utf8 = iconv_open ("utf8", "iso88591");
     if (cd_88591_to_utf8 != (iconv_t)(-1))
       {
-        static const char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337";
+        static ICONV_CONST char input[] = "\304rger mit b\366sen B\374bchen ohne Augenma\337";
         char buf[50];
-        const char *inptr = input;
+        ICONV_CONST char *inptr = input;
         size_t inbytesleft = strlen (input);
         char *outptr = buf;
         size_t outbytesleft = sizeof (buf);
         size_t res = iconv (cd_88591_to_utf8,
-                            (char **) &inptr, &inbytesleft,
+                            &inptr, &inbytesleft,
                             &outptr, &outbytesleft);
         if ((int)res > 0)
           result |= 8;
@@ -161,27 +168,36 @@ int main ()
 #endif
   /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is
      provided.  */
-  if (/* Try standardized names.  */
-      iconv_open ("UTF-8", "EUC-JP") == (iconv_t)(-1)
-      /* Try IRIX, OSF/1 names.  */
-      && iconv_open ("UTF-8", "eucJP") == (iconv_t)(-1)
-      /* Try AIX names.  */
-      && iconv_open ("UTF-8", "IBM-eucJP") == (iconv_t)(-1)
-      /* Try HP-UX names.  */
-      && iconv_open ("utf8", "eucJP") == (iconv_t)(-1))
-    result |= 16;
+  {
+    /* Try standardized names.  */
+    iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP");
+    /* Try IRIX, OSF/1 names.  */
+    iconv_t cd2 = iconv_open ("UTF-8", "eucJP");
+    /* Try AIX names.  */
+    iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP");
+    /* Try HP-UX names.  */
+    iconv_t cd4 = iconv_open ("utf8", "eucJP");
+    if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1)
+        && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1))
+      result |= 16;
+    if (cd1 != (iconv_t)(-1))
+      iconv_close (cd1);
+    if (cd2 != (iconv_t)(-1))
+      iconv_close (cd2);
+    if (cd3 != (iconv_t)(-1))
+      iconv_close (cd3);
+    if (cd4 != (iconv_t)(-1))
+      iconv_close (cd4);
+  }
   return result;
-}]])],
-        [am_cv_func_iconv_works=yes],
-        [am_cv_func_iconv_works=no],
-        [
-changequote(,)dnl
-         case "$host_os" in
-           aix* | hpux*) am_cv_func_iconv_works="guessing no" ;;
-           *)            am_cv_func_iconv_works="guessing yes" ;;
-         esac
-changequote([,])dnl
-        ])
+]])],
+          [am_cv_func_iconv_works=yes], ,
+          [case "$host_os" in
+             aix* | hpux*) am_cv_func_iconv_works="guessing no" ;;
+             *)            am_cv_func_iconv_works="guessing yes" ;;
+           esac])
+        test "$am_cv_func_iconv_works" = no || break
+      done
       LIBS="$am_save_LIBS"
     ])
     case "$am_cv_func_iconv_works" in
@@ -255,14 +271,18 @@ size_t iconv();
     am_cv_proto_iconv=`echo "[$]am_cv_proto_iconv" | tr -s ' ' | sed -e 's/( /(/'`
     AC_MSG_RESULT([
          $am_cv_proto_iconv])
-    AC_DEFINE_UNQUOTED([ICONV_CONST], [$am_cv_proto_iconv_arg1],
-      [Define as const if the declaration of iconv() needs const.])
-    dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
-    m4_ifdef([gl_ICONV_H_DEFAULTS],
-      [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
-       if test -n "$am_cv_proto_iconv_arg1"; then
-         ICONV_CONST="const"
-       fi
-      ])
+  else
+    dnl When compiling GNU libiconv on a system that does not have iconv yet,
+    dnl pick the POSIX compliant declaration without 'const'.
+    am_cv_proto_iconv_arg1=""
   fi
+  AC_DEFINE_UNQUOTED([ICONV_CONST], [$am_cv_proto_iconv_arg1],
+    [Define as const if the declaration of iconv() needs const.])
+  dnl Also substitute ICONV_CONST in the gnulib generated <iconv.h>.
+  m4_ifdef([gl_ICONV_H_DEFAULTS],
+    [AC_REQUIRE([gl_ICONV_H_DEFAULTS])
+     if test -n "$am_cv_proto_iconv_arg1"; then
+       ICONV_CONST="const"
+     fi
+    ])
 ])
diff --git a/m4/libcurl.m4 b/m4/libcurl.m4
index a84077a5e..ad53a444e 100644
--- a/m4/libcurl.m4
+++ b/m4/libcurl.m4
@@ -1,3 +1,24 @@
+#***************************************************************************
+#                                  _   _ ____  _
+#  Project                     ___| | | |  _ \| |
+#                             / __| | | | |_) | |
+#                            | (__| |_| |  _ <| |___
+#                             \___|\___/|_| \_\_____|
+#
+# Copyright (C) 2006 - 2020, David Shaw <dshaw@jabberwocky.com>
+#
+# This software is licensed as described in the file COPYING, which
+# you should have received as part of this distribution. The terms
+# are also available at https://curl.se/docs/copyright.html.
+#
+# You may opt to use, copy, modify, merge, publish, distribute and/or sell
+# copies of the Software, and permit persons to whom the Software is
+# furnished to do so, under the terms of the COPYING file.
+#
+# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+# KIND, either express or implied.
+#
+###########################################################################
 # LIBCURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],
 #                       [ACTION-IF-YES], [ACTION-IF-NO])
 # ----------------------------------------------------------
@@ -61,7 +82,7 @@ AC_DEFUN([LIBCURL_CHECK_CONFIG],
   AH_TEMPLATE([LIBCURL_PROTOCOL_SMTP],[Defined if libcurl supports SMTP])
 
   AC_ARG_WITH(libcurl,
-     AC_HELP_STRING([--with-libcurl=PREFIX],[look for the curl library in PREFIX/lib and headers in PREFIX/include]),
+     AS_HELP_STRING([--with-libcurl=PREFIX],[look for the curl library in PREFIX/lib and headers in PREFIX/include]),
      [_libcurl_with=$withval],[_libcurl_with=ifelse([$1],,[yes],[$1])])
 
   if test "$_libcurl_with" != "no" ; then
@@ -157,7 +178,7 @@ x=CURLOPT_WRITEDATA;
 x=CURLOPT_ERRORBUFFER;
 x=CURLOPT_STDERR;
 x=CURLOPT_VERBOSE;
-if (x) ;
+if (x) {;}
 ]])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
 
            CPPFLAGS=$_libcurl_save_cppflags
diff --git a/m4/libgcrypt.m4 b/m4/libgcrypt.m4
index 6cf482fcb..19d514fd5 100644
--- a/m4/libgcrypt.m4
+++ b/m4/libgcrypt.m4
@@ -1,38 +1,70 @@
-dnl Autoconf macros for libgcrypt
-dnl       Copyright (C) 2002, 2004, 2011 Free Software Foundation, Inc.
-dnl
-dnl This file is free software; as a special exception the author gives
-dnl unlimited permission to copy and/or distribute it, with or without
-dnl modifications, as long as this notice is preserved.
-dnl
-dnl This file is distributed in the hope that it will be useful, but
-dnl WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
-dnl implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+# libgcrypt.m4 - Autoconf macros to detect libgcrypt
+# Copyright (C) 2002, 2003, 2004, 2011, 2014, 2018, 2020 g10 Code GmbH
+#
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This file is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# Last-changed: 2020-09-27
 
 
 dnl AM_PATH_LIBGCRYPT([MINIMUM-VERSION,
 dnl                   [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
 dnl Test for libgcrypt and define LIBGCRYPT_CFLAGS and LIBGCRYPT_LIBS.
-dnl MINIMUN-VERSION is a string with the version number optionalliy prefixed
+dnl MINIMUM-VERSION is a string with the version number optionally prefixed
 dnl with the API version to also check the API compatibility. Example:
-dnl a MINIMUN-VERSION of 1:1.2.5 won't pass the test unless the installed
+dnl a MINIMUM-VERSION of 1:1.2.5 won't pass the test unless the installed
 dnl version of libgcrypt is at least 1.2.5 *and* the API number is 1.  Using
 dnl this features allows to prevent build against newer versions of libgcrypt
 dnl with a changed API.
 dnl
+dnl If a prefix option is not used, the config script is first
+dnl searched in $SYSROOT/bin and then along $PATH.  If the used
+dnl config script does not match the host specification the script
+dnl is added to the gpg_config_script_warn variable.
+dnl
 AC_DEFUN([AM_PATH_LIBGCRYPT],
 [ AC_REQUIRE([AC_CANONICAL_HOST])
   AC_ARG_WITH(libgcrypt-prefix,
-            AC_HELP_STRING([--with-libgcrypt-prefix=PFX],
+            AS_HELP_STRING([--with-libgcrypt-prefix=PFX],
                            [prefix where LIBGCRYPT is installed (optional)]),
      libgcrypt_config_prefix="$withval", libgcrypt_config_prefix="")
-  if test x$libgcrypt_config_prefix != x ; then
-     if test x${LIBGCRYPT_CONFIG+set} != xset ; then
-        LIBGCRYPT_CONFIG=$libgcrypt_config_prefix/bin/libgcrypt-config
+  if test x"${LIBGCRYPT_CONFIG}" = x ; then
+     if test x"${libgcrypt_config_prefix}" != x ; then
+        LIBGCRYPT_CONFIG="${libgcrypt_config_prefix}/bin/libgcrypt-config"
      fi
   fi
 
-  AC_PATH_TOOL(LIBGCRYPT_CONFIG, libgcrypt-config, no)
+  use_gpgrt_config=""
+  if test x"${LIBGCRYPT_CONFIG}" = x -a x"$GPGRT_CONFIG" != x -a "$GPGRT_CONFIG" != "no"; then
+    if $GPGRT_CONFIG libgcrypt --exists; then
+      LIBGCRYPT_CONFIG="$GPGRT_CONFIG libgcrypt"
+      AC_MSG_NOTICE([Use gpgrt-config as libgcrypt-config])
+      use_gpgrt_config=yes
+    fi
+  fi
+  if test -z "$use_gpgrt_config"; then
+    if test x"${LIBGCRYPT_CONFIG}" = x ; then
+      case "${SYSROOT}" in
+         /*)
+           if test -x "${SYSROOT}/bin/libgcrypt-config" ; then
+             LIBGCRYPT_CONFIG="${SYSROOT}/bin/libgcrypt-config"
+           fi
+           ;;
+         '')
+           ;;
+          *)
+           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
+           ;;
+      esac
+    fi
+    AC_PATH_PROG(LIBGCRYPT_CONFIG, libgcrypt-config, no)
+  fi
+
   tmp=ifelse([$1], ,1:1.2.0,$1)
   if echo "$tmp" | grep ':' >/dev/null 2>/dev/null ; then
      req_libgcrypt_api=`echo "$tmp"     | sed 's/\(.*\):\(.*\)/\1/'`
@@ -51,7 +83,11 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
     req_micro=`echo $min_libgcrypt_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`
-    libgcrypt_config_version=`$LIBGCRYPT_CONFIG --version`
+    if test -z "$use_gpgrt_config"; then
+      libgcrypt_config_version=`$LIBGCRYPT_CONFIG --version`
+    else
+      libgcrypt_config_version=`$LIBGCRYPT_CONFIG --modversion`
+    fi
     major=`echo $libgcrypt_config_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
     minor=`echo $libgcrypt_config_version | \
@@ -83,7 +119,11 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
      # If we have a recent libgcrypt, we should also check that the
      # API is compatible
      if test "$req_libgcrypt_api" -gt 0 ; then
-        tmp=`$LIBGCRYPT_CONFIG --api-version 2>/dev/null || echo 0`
+        if test -z "$use_gpgrt_config"; then
+           tmp=`$LIBGCRYPT_CONFIG --api-version 2>/dev/null || echo 0`
+        else
+           tmp=`$LIBGCRYPT_CONFIG --variable=api_version 2>/dev/null || echo 0`
+        fi
         if test "$tmp" -gt 0 ; then
            AC_MSG_CHECKING([LIBGCRYPT API version])
            if test "$req_libgcrypt_api" -eq "$tmp" ; then
@@ -99,17 +139,22 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
     LIBGCRYPT_CFLAGS=`$LIBGCRYPT_CONFIG --cflags`
     LIBGCRYPT_LIBS=`$LIBGCRYPT_CONFIG --libs`
     ifelse([$2], , :, [$2])
-    libgcrypt_config_host=`$LIBGCRYPT_CONFIG --host 2>/dev/null || echo none`
+    if test -z "$use_gpgrt_config"; then
+      libgcrypt_config_host=`$LIBGCRYPT_CONFIG --host 2>/dev/null || echo none`
+    else
+      libgcrypt_config_host=`$LIBGCRYPT_CONFIG --variable=host 2>/dev/null || echo none`
+    fi
     if test x"$libgcrypt_config_host" != xnone ; then
       if test x"$libgcrypt_config_host" != x"$host" ; then
   AC_MSG_WARN([[
 ***
-*** The config script $LIBGCRYPT_CONFIG was
+*** The config script "$LIBGCRYPT_CONFIG" was
 *** built for $libgcrypt_config_host and thus may not match the
 *** used host $host.
 *** You may want to use the configure option --with-libgcrypt-prefix
-*** to specify a matching config script.
+*** to specify a matching config script or use \$SYSROOT.
 ***]])
+        gpg_config_script_warn="$gpg_config_script_warn libgcrypt"
       fi
     fi
   else
diff --git a/m4/libgnurl.m4 b/m4/libgnurl.m4
deleted file mode 100644
index da72e5e87..000000000
--- a/m4/libgnurl.m4
+++ /dev/null
@@ -1,266 +0,0 @@
-# LIBGNURL_CHECK_CONFIG ([DEFAULT-ACTION], [MINIMUM-VERSION],
-#                       [ACTION-IF-YES], [ACTION-IF-NO])
-# ----------------------------------------------------------
-#      David Shaw <dshaw@jabberwocky.com>   May-09-2006
-#
-# Checks for libgnurl.  DEFAULT-ACTION is the string yes or no to
-# specify whether to default to --with-libgnurl or --without-libgnurl.
-# If not supplied, DEFAULT-ACTION is yes.  MINIMUM-VERSION is the
-# minimum version of libgnurl to accept.  Pass the version as a regular
-# version number like 7.10.1. If not supplied, any version is
-# accepted.  ACTION-IF-YES is a list of shell commands to run if
-# libgnurl was successfully found and passed the various tests.
-# ACTION-IF-NO is a list of shell commands that are run otherwise.
-# Note that using --without-libgnurl does run ACTION-IF-NO.
-#
-# This macro #defines HAVE_LIBGNURL if a working libgnurl setup is
-# found, and sets @LIBGNURL@ and @LIBGNURL_CPPFLAGS@ to the necessary
-# values.  Other useful defines are LIBGNURL_FEATURE_xxx where xxx are
-# the various features supported by libgnurl, and LIBGNURL_PROTOCOL_yyy
-# where yyy are the various protocols supported by libgnurl.  Both xxx
-# and yyy are capitalized.  See the list of AH_TEMPLATEs at the top of
-# the macro for the complete list of possible defines.  Shell
-# variables $libgnurl_feature_xxx and $libgnurl_protocol_yyy are also
-# defined to 'yes' for those features and protocols that were found.
-# Note that xxx and yyy keep the same capitalization as in the
-# gnurl-config list (e.g. it's "HTTP" and not "http").
-#
-# Users may override the detected values by doing something like:
-# LIBGNURL="-lgnurl" LIBGNURL_CPPFLAGS="-I/usr/myinclude" ./configure
-#
-# For the sake of sanity, this macro assumes that any libgnurl that is
-# found is after version 7.7.2, the first version that included the
-# gnurl-config script.  Note that it is very important for people
-# packaging binary versions of libgnurl to include this script!
-# Without gnurl-config, we can only guess what protocols are available,
-# or use gnurl_version_info to figure it out at runtime.
-
-AC_DEFUN([LIBGNURL_CHECK_CONFIG],
-[
-  AH_TEMPLATE([LIBGNURL_FEATURE_SSL],[Defined if libgnurl supports SSL])
-  AH_TEMPLATE([LIBGNURL_FEATURE_KRB4],[Defined if libgnurl supports KRB4])
-  AH_TEMPLATE([LIBGNURL_FEATURE_IPV6],[Defined if libgnurl supports IPv6])
-  AH_TEMPLATE([LIBGNURL_FEATURE_LIBZ],[Defined if libgnurl supports libz])
-  AH_TEMPLATE([LIBGNURL_FEATURE_ASYNCHDNS],[Defined if libgnurl supports AsynchDNS])
-  AH_TEMPLATE([LIBGNURL_FEATURE_IDN],[Defined if libgnurl supports IDN])
-  AH_TEMPLATE([LIBGNURL_FEATURE_SSPI],[Defined if libgnurl supports SSPI])
-  AH_TEMPLATE([LIBGNURL_FEATURE_NTLM],[Defined if libgnurl supports NTLM])
-
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_HTTP],[Defined if libgnurl supports HTTP])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_HTTPS],[Defined if libgnurl supports HTTPS])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_FTP],[Defined if libgnurl supports FTP])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_FTPS],[Defined if libgnurl supports FTPS])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_FILE],[Defined if libgnurl supports FILE])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_TELNET],[Defined if libgnurl supports TELNET])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_LDAP],[Defined if libgnurl supports LDAP])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_DICT],[Defined if libgnurl supports DICT])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_TFTP],[Defined if libgnurl supports TFTP])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_RTSP],[Defined if libgnurl supports RTSP])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_POP3],[Defined if libgnurl supports POP3])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_IMAP],[Defined if libgnurl supports IMAP])
-  AH_TEMPLATE([LIBGNURL_PROTOCOL_SMTP],[Defined if libgnurl supports SMTP])
-
-  AC_ARG_WITH(libgnurl,
-     AC_HELP_STRING([--with-libgnurl=PREFIX],[look for the gnurl library in PREFIX/lib and headers in PREFIX/include]),
-     [_libgnurl_with=$withval],[_libgnurl_with=ifelse([$1],,[yes],[$1])])
-
-  if test "$_libgnurl_with" != "no" ; then
-
-     AC_PROG_AWK
-
-     _libgnurl_version_parse="eval $AWK '{split(\$NF,A,\".\"); X=256*256*A[[1]]+256*A[[2]]+A[[3]]; print X;}'"
-
-     _libgnurl_try_link=yes
-
-     if test -d "$_libgnurl_with" ; then
-        LIBGNURL_CPPFLAGS="-I$withval/include"
-        _libgnurl_ldflags="-L$withval/lib"
-        AC_PATH_PROG([_libgnurl_config],[gnurl-config],[],
-                     ["$withval/bin"])
-     else
-        AC_PATH_PROG([_libgnurl_config],[gnurl-config],[],[$PATH])
-     fi
-
-     if test x$_libgnurl_config != "x" ; then
-        AC_CACHE_CHECK([for the version of libgnurl],
-           [libgnurl_cv_lib_gnurl_version],
-           [libgnurl_cv_lib_gnurl_version=`$_libgnurl_config --version | $AWK '{print $[]2}'`])
-
-        _libgnurl_version=`echo $libgnurl_cv_lib_gnurl_version | $_libgnurl_version_parse`
-        _libgnurl_wanted=`echo ifelse([$2],,[0],[$2]) | $_libgnurl_version_parse`
-
-        if test $_libgnurl_wanted -gt 0 ; then
-           AC_CACHE_CHECK([for libgnurl >= version $2],
-              [libgnurl_cv_lib_version_ok],
-              [
-              if test $_libgnurl_version -ge $_libgnurl_wanted ; then
-                 libgnurl_cv_lib_version_ok=yes
-              else
-                 libgnurl_cv_lib_version_ok=no
-              fi
-              ])
-        fi
-
-        if test $_libgnurl_wanted -eq 0 || test x$libgnurl_cv_lib_version_ok = xyes ; then
-           if test x"$LIBGNURL_CPPFLAGS" = "x" ; then
-              LIBGNURL_CPPFLAGS=`$_libgnurl_config --cflags`
-           fi
-           if test x"$LIBGNURL" = "x" ; then
-              LIBGNURL=`$_libgnurl_config --libs`
-
-              # This is so silly, but Apple actually has a bug in their
-              # gnurl-config script.  Fixed in Tiger, but there are still
-              # lots of Panther installs around.
-              case "${host}" in
-                 powerpc-apple-darwin7*)
-                    LIBGNURL=`echo $LIBGNURL | sed -e 's|-arch i386||g'`
-                 ;;
-              esac
-           fi
-
-           # All gnurl-config scripts support --feature
-           _libgnurl_features=`$_libgnurl_config --feature`
-
-           # Is it modern enough to have --protocols? (7.12.4)
-           if test $_libgnurl_version -ge 461828 ; then
-              _libgnurl_protocols=`$_libgnurl_config --protocols`
-           fi
-        else
-           _libgnurl_try_link=no
-        fi
-
-        unset _libgnurl_wanted
-     fi
-
-     if test $_libgnurl_try_link = yes ; then
-
-        # we didn't find gnurl-config, so let's see if the user-supplied
-        # link line (or failing that, "-lgnurl") is enough.
-        LIBGNURL=${LIBGNURL-"$_libgnurl_ldflags -lgnurl"}
-
-        AC_CACHE_CHECK([whether libgnurl is usable],
-           [libgnurl_cv_lib_gnurl_usable],
-           [
-           _libgnurl_save_cppflags=$CPPFLAGS
-           CPPFLAGS="$LIBGNURL_CPPFLAGS $CPPFLAGS"
-           _libgnurl_save_libs=$LIBS
-           LIBS="$LIBGNURL $LIBS"
-
-           AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <curl/curl.h>],[
-/* Try and use a few common options to force a failure if we are
-   missing symbols or can't link. */
-int x;
-curl_easy_setopt(NULL,CURLOPT_URL,NULL);
-x=CURL_ERROR_SIZE;
-x=CURLOPT_WRITEFUNCTION;
-x=CURLOPT_FILE;
-x=CURLOPT_ERRORBUFFER;
-x=CURLOPT_STDERR;
-x=CURLOPT_VERBOSE;
-])],libgnurl_cv_lib_gnurl_usable=yes,libgnurl_cv_lib_gnurl_usable=no)
-
-# BEGIN Changes from original libcurl.m4:
-# Give it a 2nd shot using 'gnurl/curl.h'
-           AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <gnurl/curl.h>],[
-/* Try and use a few common options to force a failure if we are
-   missing symbols or can't link. */
-int x;
-curl_easy_setopt(NULL,CURLOPT_URL,NULL);
-x=CURL_ERROR_SIZE;
-x=CURLOPT_WRITEFUNCTION;
-x=CURLOPT_FILE;
-x=CURLOPT_ERRORBUFFER;
-x=CURLOPT_STDERR;
-x=CURLOPT_VERBOSE;
-])],libgnurl_cv_lib_gnurl_usable=yes)
-# END Changes from original libcurl.m4:
-
-           CPPFLAGS=$_libgnurl_save_cppflags
-           LIBS=$_libgnurl_save_libs
-           unset _libgnurl_save_cppflags
-           unset _libgnurl_save_libs
-           ])
-
-        if test $libgnurl_cv_lib_gnurl_usable = yes ; then
-
-           # Does gnurl_free() exist in this version of libgnurl?
-           # If not, fake it with free()
-
-           _libgnurl_save_cppflags=$CPPFLAGS
-           CPPFLAGS="$CPPFLAGS $LIBGNURL_CPPFLAGS"
-           _libgnurl_save_libs=$LIBS
-           LIBS="$LIBS $LIBGNURL"
-
-           AC_CHECK_FUNC(curl_free,,
-              AC_DEFINE(curl_free,free,
-                [Define curl_free() as free() if our version of gnurl lacks curl_free.]))
-
-           CPPFLAGS=$_libgnurl_save_cppflags
-           LIBS=$_libgnurl_save_libs
-           unset _libgnurl_save_cppflags
-           unset _libgnurl_save_libs
-
-           AC_DEFINE(HAVE_LIBGNURL,1,
-             [Define to 1 if you have a functional gnurl library.])
-           AC_SUBST(LIBGNURL_CPPFLAGS)
-           AC_SUBST(LIBGNURL)
-
-           for _libgnurl_feature in $_libgnurl_features ; do
-              AC_DEFINE_UNQUOTED(AS_TR_CPP(libgnurl_feature_$_libgnurl_feature),[1])
-              eval AS_TR_SH(libgnurl_feature_$_libgnurl_feature)=yes
-           done
-
-           if test "x$_libgnurl_protocols" = "x" ; then
-
-              # We don't have --protocols, so just assume that all
-              # protocols are available
-              _libgnurl_protocols="HTTP FTP FILE TELNET LDAP DICT TFTP"
-
-              if test x$libgnurl_feature_SSL = xyes ; then
-                 _libgnurl_protocols="$_libgnurl_protocols HTTPS"
-
-                 # FTPS wasn't standards-compliant until version
-                 # 7.11.0 (0x070b00 == 461568)
-                 if test $_libgnurl_version -ge 461568; then
-                    _libgnurl_protocols="$_libgnurl_protocols FTPS"
-                 fi
-              fi
-
-              # RTSP, IMAP, POP3 and SMTP were added in
-              # 7.20.0 (0x071400 == 463872)
-              if test $_libgnurl_version -ge 463872; then
-                 _libgnurl_protocols="$_libgnurl_protocols RTSP IMAP POP3 SMTP"
-              fi
-           fi
-
-           for _libgnurl_protocol in $_libgnurl_protocols ; do
-              AC_DEFINE_UNQUOTED(AS_TR_CPP(libgnurl_protocol_$_libgnurl_protocol),[1])
-              eval AS_TR_SH(libgnurl_protocol_$_libgnurl_protocol)=yes
-           done
-        else
-           unset LIBGNURL
-           unset LIBGNURL_CPPFLAGS
-        fi
-     fi
-
-     unset _libgnurl_try_link
-     unset _libgnurl_version_parse
-     unset _libgnurl_config
-     unset _libgnurl_feature
-     unset _libgnurl_features
-     unset _libgnurl_protocol
-     unset _libgnurl_protocols
-     unset _libgnurl_version
-     unset _libgnurl_ldflags
-  fi
-
-  if test x$_libgnurl_with = xno || test x$libgnurl_cv_lib_gnurl_usable != xyes ; then
-     # This is the IF-NO path
-     ifelse([$4],,:,[$4])
-  else
-     # This is the IF-YES path
-     ifelse([$3],,:,[$3])
-  fi
-
-  unset _libgnurl_with
-])dnl
diff --git a/m4/libunistring.m4 b/m4/libunistring.m4
index c1bf4d553..e3d944793 100644
--- a/m4/libunistring.m4
+++ b/m4/libunistring.m4
@@ -1,9 +1,11 @@
-# libunistring.m4 serial 11
-dnl Copyright (C) 2009-2012 Free Software Foundation, Inc.
+# libunistring.m4 serial 12
+dnl Copyright (C) 2009-2021 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
 
+AC_PREREQ([2.64])
+
 dnl gl_LIBUNISTRING
 dnl Searches for an installed libunistring.
 dnl If found, it sets and AC_SUBSTs HAVE_LIBUNISTRING=yes and the LIBUNISTRING
@@ -12,8 +14,8 @@ dnl augments the CPPFLAGS variable, and #defines HAVE_LIBUNISTRING to 1.
 dnl Otherwise, it sets and AC_SUBSTs HAVE_LIBUNISTRING=no and LIBUNISTRING and
 dnl LTLIBUNISTRING to empty.
 
-dnl Define gl_LIBUNISTRING using AC_DEFUN_ONCE for Autoconf >= 2.64, in order
-dnl to avoid warnings like
+dnl Define gl_LIBUNISTRING using AC_DEFUN_ONCE, in order dnl to avoid warnings
+dnl like
 dnl "warning: AC_REQUIRE: `gl_LIBUNISTRING' was expanded before it was required".
 dnl This is tricky because of the way 'aclocal' is implemented:
 dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
@@ -21,16 +23,7 @@ dnl   Otherwise aclocal's initial scan pass would miss the macro definition.
 dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
 dnl   Otherwise aclocal would emit many "Use of uninitialized value $1"
 dnl   warnings.
-m4_define([gl_libunistring_AC_DEFUN],
-  m4_version_prereq([2.64],
-    [[AC_DEFUN_ONCE(
-        [$1], [$2])]],
-    [m4_ifdef([gl_00GNULIB],
-       [[AC_DEFUN_ONCE(
-           [$1], [$2])]],
-       [[AC_DEFUN(
-           [$1], [$2])]])]))
-gl_libunistring_AC_DEFUN([gl_LIBUNISTRING],
+AC_DEFUN_ONCE([gl_LIBUNISTRING],
 [
   AC_BEFORE([$0], [gl_LIBUNISTRING_MODULE])
   AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
diff --git a/m4/threadlib.m4 b/m4/threadlib.m4
index dc9a3d8e8..80af285bf 100644
--- a/m4/threadlib.m4
+++ b/m4/threadlib.m4
@@ -53,8 +53,8 @@ AC_DEFUN([gl_THREADLIB_EARLY_BODY],
     [m4_divert_text([DEFAULTS], [gl_use_threads_default=no])],
     [m4_divert_text([DEFAULTS], [gl_use_threads_default=])])
   AC_ARG_ENABLE([threads],
-AC_HELP_STRING([--enable-threads={posix|solaris|pth|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [
-AC_HELP_STRING([--disable-threads], [build without multithread safety])]),
+AS_HELP_STRING([--enable-threads={posix|solaris|pth|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [
+AS_HELP_STRING([--disable-threads], [build without multithread safety])]),
     [gl_use_threads=$enableval],
     [if test -n "$gl_use_threads_default"; then
        gl_use_threads="$gl_use_threads_default"