m4: Update our library m4 files from master

* m4/gpg-error.m4: Updated
* m4/ksba.m4: Updated
* m4/libassuan.m4: Updated
* m4/libgcrypt.m4: Updated
* m4/npth.m4: Updated
* m4/ntbtls.m4: Updated
--

This better fits with the new gpgrt-config system

6 files changed, 353 insertions, 162 deletions

diff --git a/m4/gpg-error.m4 b/m4/gpg-error.m4
index 1661204c2..56a5d0752 100644
--- a/m4/gpg-error.m4
+++ b/m4/gpg-error.m4
@@ -1,5 +1,6 @@
 # gpg-error.m4 - autoconf macro to detect libgpg-error.
-# Copyright (C) 2002, 2003, 2004, 2011, 2014 g10 Code GmbH
+# Copyright (C) 2002, 2003, 2004, 2011, 2014, 2018, 2020, 2021
+#               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
@@ -9,7 +10,7 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 #
-# Last-changed: 2014-10-02
+# Last-changed: 2021-03-31
 
 
 dnl AM_PATH_GPG_ERROR([MINIMUM-VERSION,
@@ -31,7 +32,7 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
   dnl since that is consistent with how our three siblings use the directory/
   dnl package name in --with-$dir_name-prefix=PFX.
   AC_ARG_WITH(libgpg-error-prefix,
-              AC_HELP_STRING([--with-libgpg-error-prefix=PFX],
+              AS_HELP_STRING([--with-libgpg-error-prefix=PFX],
                              [prefix where GPG Error is installed (optional)]),
               [gpg_error_config_prefix="$withval"])
 
@@ -61,16 +62,89 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
   fi
 
   AC_PATH_PROG(GPG_ERROR_CONFIG, gpg-error-config, no)
-  min_gpg_error_version=ifelse([$1], ,0.0,$1)
-  AC_MSG_CHECKING(for GPG Error - version >= $min_gpg_error_version)
+  min_gpg_error_version=ifelse([$1], ,1.33,$1)
   ok=no
-  if test "$GPG_ERROR_CONFIG" != "no" \
-     && test -f "$GPG_ERROR_CONFIG" ; then
+
+  AC_PATH_PROG(GPGRT_CONFIG, gpgrt-config, no, [$prefix/bin:$PATH])
+  if test "$GPGRT_CONFIG" != "no"; then
+    # Determine gpgrt_libdir
+    #
+    # Get the prefix of gpgrt-config assuming it's something like:
+    #   <PREFIX>/bin/gpgrt-config
+    gpgrt_prefix=${GPGRT_CONFIG%/*/*}
+    possible_libdir1=${gpgrt_prefix}/lib
+    # Determine by using system libdir-format with CC, it's like:
+    #   Normal style: /usr/lib
+    #   GNU cross style: /usr/<triplet>/lib
+    #   Debian style: /usr/lib/<multiarch-name>
+    #   Fedora/openSUSE style: /usr/lib, /usr/lib32 or /usr/lib64
+    # It is assumed that CC is specified to the one of host on cross build.
+    if libdir_candidates=$(${CC:-cc} -print-search-dirs | \
+          sed -n -e "/^libraries/{s/libraries: =//;s/:/\\
+/g;p;}"); then
+      # From the output of -print-search-dirs, select valid pkgconfig dirs.
+      libdir_candidates=$(for dir in $libdir_candidates; do
+        if p=$(cd $dir 2>/dev/null && pwd); then
+          test -d "$p/pkgconfig" && echo $p;
+        fi
+      done)
+
+      for possible_libdir0 in $libdir_candidates; do
+        # possible_libdir0:
+        #   Fallback candidate, the one of system-installed (by $CC)
+        #   (/usr/<triplet>/lib, /usr/lib/<multiarch-name> or /usr/lib32)
+        # possible_libdir1:
+        #   Another candidate, user-locally-installed
+        #   (<gpgrt_prefix>/lib)
+        # possible_libdir2
+        #   Most preferred
+        #   (<gpgrt_prefix>/<triplet>/lib,
+        #    <gpgrt_prefix>/lib/<multiarch-name> or <gpgrt_prefix>/lib32)
+        if test "${possible_libdir0##*/}" = "lib"; then
+          possible_prefix0=${possible_libdir0%/lib}
+          possible_prefix0_triplet=${possible_prefix0##*/}
+          if test -z "$possible_prefix0_triplet"; then
+            continue
+          fi
+          possible_libdir2=${gpgrt_prefix}/$possible_prefix0_triplet/lib
+        else
+          possible_prefix0=${possible_libdir0%%/lib*}
+          possible_libdir2=${gpgrt_prefix}${possible_libdir0#$possible_prefix0}
+        fi
+        if test -f ${possible_libdir2}/pkgconfig/gpg-error.pc; then
+          gpgrt_libdir=${possible_libdir2}
+        elif test -f ${possible_libdir1}/pkgconfig/gpg-error.pc; then
+          gpgrt_libdir=${possible_libdir1}
+        elif test -f ${possible_libdir0}/pkgconfig/gpg-error.pc; then
+          gpgrt_libdir=${possible_libdir0}
+        fi
+        if test -n "$gpgrt_libdir"; then break; fi
+      done
+    else
+      # When we cannot determine system libdir-format, use this:
+      gpgrt_libdir=${possible_libdir1}
+    fi
+  else
+    unset GPGRT_CONFIG
+  fi
+
+  if test -n "$gpgrt_libdir"; then
+    GPGRT_CONFIG="$GPGRT_CONFIG --libdir=$gpgrt_libdir"
+    if $GPGRT_CONFIG gpg-error >/dev/null 2>&1; then
+      GPG_ERROR_CONFIG="$GPGRT_CONFIG gpg-error"
+      AC_MSG_NOTICE([Use gpgrt-config with $gpgrt_libdir as gpg-error-config])
+      gpg_error_config_version=`$GPG_ERROR_CONFIG --modversion`
+    else
+      unset GPGRT_CONFIG
+    fi
+  elif test "$GPG_ERROR_CONFIG" != "no"; then
+    gpg_error_config_version=`$GPG_ERROR_CONFIG --version`
+  fi
+  if test "$GPG_ERROR_CONFIG" != "no"; then
     req_major=`echo $min_gpg_error_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
     req_minor=`echo $min_gpg_error_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
-    gpg_error_config_version=`$GPG_ERROR_CONFIG $gpg_error_config_args --version`
     major=`echo $gpg_error_config_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
     minor=`echo $gpg_error_config_version | \
@@ -85,22 +159,34 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
         fi
     fi
   fi
+  AC_MSG_CHECKING(for GPG Error - version >= $min_gpg_error_version)
   if test $ok = yes; then
-    GPG_ERROR_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --cflags`
-    GPG_ERROR_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --libs`
-    GPG_ERROR_MT_CFLAGS=`$GPG_ERROR_CONFIG $gpg_error_config_args --mt --cflags 2>/dev/null`
-    GPG_ERROR_MT_LIBS=`$GPG_ERROR_CONFIG $gpg_error_config_args --mt --libs 2>/dev/null`
+    GPG_ERROR_CFLAGS=`$GPG_ERROR_CONFIG --cflags`
+    GPG_ERROR_LIBS=`$GPG_ERROR_CONFIG --libs`
+    if test -z "$GPGRT_CONFIG"; then
+      GPG_ERROR_MT_CFLAGS=`$GPG_ERROR_CONFIG --mt --cflags 2>/dev/null`
+      GPG_ERROR_MT_LIBS=`$GPG_ERROR_CONFIG --mt --libs 2>/dev/null`
+    else
+      GPG_ERROR_MT_CFLAGS=`$GPG_ERROR_CONFIG --variable=mtcflags 2>/dev/null`
+      GPG_ERROR_MT_CFLAGS="$GPG_ERROR_CFLAGS${GPG_ERROR_CFLAGS:+ }$GPG_ERROR_MT_CFLAGS"
+      GPG_ERROR_MT_LIBS=`$GPG_ERROR_CONFIG --variable=mtlibs 2>/dev/null`
+      GPG_ERROR_MT_LIBS="$GPG_ERROR_LIBS${GPG_ERROR_LIBS:+ }$GPG_ERROR_MT_LIBS"
+    fi
     AC_MSG_RESULT([yes ($gpg_error_config_version)])
     ifelse([$2], , :, [$2])
-    gpg_error_config_host=`$GPG_ERROR_CONFIG $gpg_error_config_args --host 2>/dev/null || echo none`
+    if test -z "$GPGRT_CONFIG"; then
+      gpg_error_config_host=`$GPG_ERROR_CONFIG --host 2>/dev/null || echo none`
+    else
+      gpg_error_config_host=`$GPG_ERROR_CONFIG --variable=host 2>/dev/null || echo none`
+    fi
     if test x"$gpg_error_config_host" != xnone ; then
       if test x"$gpg_error_config_host" != x"$host" ; then
   AC_MSG_WARN([[
 ***
-*** The config script $GPG_ERROR_CONFIG was
+*** The config script "$GPG_ERROR_CONFIG" was
 *** built for $gpg_error_config_host and thus may not match the
 *** used host $host.
-*** You may want to use the configure option --with-gpg-error-prefix
+*** You may want to use the configure option --with-libgpg-error-prefix
 *** to specify a matching config script or use \$SYSROOT.
 ***]])
         gpg_config_script_warn="$gpg_config_script_warn libgpg-error"
diff --git a/m4/ksba.m4 b/m4/ksba.m4
index 3e14e6744..6b55bb899 100644
--- a/m4/ksba.m4
+++ b/m4/ksba.m4
@@ -1,5 +1,5 @@
 # ksba.m4 - autoconf macro to detect ksba
-#       Copyright (C) 2002 g10 Code GmbH
+#       Copyright (C) 2002, 2018 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
@@ -8,32 +8,53 @@
 # 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: 2020-11-18
 
 dnl AM_PATH_KSBA([MINIMUM-VERSION,
 dnl              [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
 dnl Test for libksba and define KSBA_CFLAGS and KSBA_LIBS
-dnl MINIMUM-VERSION is a string with the version number optionalliy prefixed
+dnl MINIMUN-VERSION is a string with the version number optionalliy prefixed
 dnl with the API version to also check the API compatibility. Example:
-dnl a MINIMUM-VERSION of 1:1.0.7 won't pass the test unless the installed
+dnl a MINIMUN-VERSION of 1:1.0.7 won't pass the test unless the installed
 dnl version of libksba is at least 1.0.7 *and* the API number is 1.  Using
-dnl this feature prevents building against newer versions of libksba
+dnl this features allows to prevent build against newer versions of libksba
 dnl with a changed API.
 dnl
 AC_DEFUN([AM_PATH_KSBA],
-[AC_REQUIRE([AC_CANONICAL_HOST])
- AC_ARG_WITH(ksba-prefix,
-            AC_HELP_STRING([--with-ksba-prefix=PFX],
-                           [prefix where KSBA is installed (optional)]),
+[ AC_REQUIRE([AC_CANONICAL_HOST])
+  dnl --with-libksba-prefix=PFX is the preferred name for this option,
+  dnl since that is consistent with how our three siblings use the directory/
+  dnl package name in --with-$dir_name-prefix=PFX.
+  AC_ARG_WITH(libksba-prefix,
+              AS_HELP_STRING([--with-libksba-prefix=PFX],
+                             [prefix where KSBA is installed (optional)]),
+     ksba_config_prefix="$withval", ksba_config_prefix="")
+
+  dnl Accept --with-ksba-prefix and make it work the same as
+  dnl --with-libksba-prefix above, for backwards compatibility,
+  dnl but do not document this old, inconsistently-named option.
+  AC_ARG_WITH(ksba-prefix,,
      ksba_config_prefix="$withval", ksba_config_prefix="")
+
   if test x$ksba_config_prefix != x ; then
-     ksba_config_args="$ksba_config_args --prefix=$ksba_config_prefix"
-     if test x${KSBA_CONFIG+set} != xset ; then
-        KSBA_CONFIG=$ksba_config_prefix/bin/ksba-config
-     fi
+    if test x${KSBA_CONFIG+set} != xset ; then
+      KSBA_CONFIG=$ksba_config_prefix/bin/ksba-config
+    fi
+  fi
+
+  use_gpgrt_config=""
+  if test x"$KSBA_CONFIG" = x -a x"$GPGRT_CONFIG" != x -a "$GPGRT_CONFIG" != "no"; then
+    if $GPGRT_CONFIG ksba --exists; then
+      KSBA_CONFIG="$GPGRT_CONFIG ksba"
+      AC_MSG_NOTICE([Use gpgrt-config as ksba-config])
+      use_gpgrt_config=yes
+    fi
+  fi
+  if test -z "$use_gpgrt_config"; then
+    AC_PATH_PROG(KSBA_CONFIG, ksba-config, no)
   fi
 
-  AC_PATH_PROG(KSBA_CONFIG, ksba-config, no)
   tmp=ifelse([$1], ,1:1.0.0,$1)
   if echo "$tmp" | grep ':' >/dev/null 2>/dev/null ; then
      req_ksba_api=`echo "$tmp"     | sed 's/\(.*\):\(.*\)/\1/'`
@@ -52,7 +73,11 @@ AC_DEFUN([AM_PATH_KSBA],
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
     req_micro=`echo $min_ksba_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`
-    ksba_config_version=`$KSBA_CONFIG $ksba_config_args --version`
+    if test -z "$use_gpgrt_config"; then
+      ksba_config_version=`$KSBA_CONFIG --version`
+    else
+      ksba_config_version=`$KSBA_CONFIG --modversion`
+    fi
     major=`echo $ksba_config_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
     minor=`echo $ksba_config_version | \
@@ -84,7 +109,11 @@ AC_DEFUN([AM_PATH_KSBA],
      # Even if we have a recent libksba, we should check that the
      # API is compatible.
      if test "$req_ksba_api" -gt 0 ; then
-        tmp=`$KSBA_CONFIG --api-version 2>/dev/null || echo 0`
+        if test -z "$use_gpgrt_config"; then
+          tmp=`$KSBA_CONFIG --api-version 2>/dev/null || echo 0`
+	else
+          tmp=`$KSBA_CONFIG --variable=api_version 2>/dev/null || echo 0`
+	fi
         if test "$tmp" -gt 0 ; then
            AC_MSG_CHECKING([KSBA API version])
            if test "$req_ksba_api" -eq "$tmp" ; then
@@ -97,15 +126,19 @@ AC_DEFUN([AM_PATH_KSBA],
      fi
   fi
   if test $ok = yes; then
-    KSBA_CFLAGS=`$KSBA_CONFIG $ksba_config_args --cflags`
-    KSBA_LIBS=`$KSBA_CONFIG $ksba_config_args --libs`
+    KSBA_CFLAGS=`$KSBA_CONFIG --cflags`
+    KSBA_LIBS=`$KSBA_CONFIG --libs`
     ifelse([$2], , :, [$2])
-    libksba_config_host=`$LIBKSBA_CONFIG $ksba_config_args --host 2>/dev/null || echo none`
+    if test -z "$use_gpgrt_config"; then
+      libksba_config_host=`$KSBA_CONFIG --host 2>/dev/null || echo none`
+    else
+      libksba_config_host=`$KSBA_CONFIG --variable=host 2>/dev/null || echo none`
+    fi
     if test x"$libksba_config_host" != xnone ; then
       if test x"$libksba_config_host" != x"$host" ; then
   AC_MSG_WARN([[
 ***
-*** The config script $LIBKSBA_CONFIG was
+*** The config script "$KSBA_CONFIG" was
 *** built for $libksba_config_host and thus may not match the
 *** used host $host.
 *** You may want to use the configure option --with-libksba-prefix
diff --git a/m4/libassuan.m4 b/m4/libassuan.m4
index 004eee392..df504841d 100644
--- a/m4/libassuan.m4
+++ b/m4/libassuan.m4
@@ -1,5 +1,5 @@
 dnl Autoconf macros for libassuan
-dnl       Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+dnl Copyright (C) 2002, 2003, 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
@@ -8,23 +8,36 @@ 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.
+dnl SPDX-License-Identifier: FSFULLR
+# Last-changed: 2020-11-17
 
 dnl
 dnl Common code used for libassuan detection [internal]
 dnl Returns ok set to yes or no.
 dnl
 AC_DEFUN([_AM_PATH_LIBASSUAN_COMMON],
-[ AC_ARG_WITH(libassuan-prefix,
-              AC_HELP_STRING([--with-libassuan-prefix=PFX],
+[ AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_ARG_WITH(libassuan-prefix,
+              AS_HELP_STRING([--with-libassuan-prefix=PFX],
                              [prefix where LIBASSUAN is installed (optional)]),
      libassuan_config_prefix="$withval", libassuan_config_prefix="")
   if test x$libassuan_config_prefix != x ; then
-    libassuan_config_args="$libassuan_config_args --prefix=$libassuan_config_prefix"
     if test x${LIBASSUAN_CONFIG+set} != xset ; then
       LIBASSUAN_CONFIG=$libassuan_config_prefix/bin/libassuan-config
     fi
   fi
-  AC_PATH_PROG(LIBASSUAN_CONFIG, libassuan-config, no)
+
+  use_gpgrt_config=""
+  if test x"${LIBASSUAN_CONFIG}" = x -a x"$GPGRT_CONFIG" != x -a "$GPGRT_CONFIG" != "no"; then
+    if $GPGRT_CONFIG libassuan --exists; then
+      LIBASSUAN_CONFIG="$GPGRT_CONFIG libassuan"
+      AC_MSG_NOTICE([Use gpgrt-config as libassuan-config])
+      use_gpgrt_config=yes
+    fi
+  fi
+  if test -z "$use_gpgrt_config"; then
+    AC_PATH_PROG(LIBASSUAN_CONFIG, libassuan-config, no)
+  fi
 
   tmp=ifelse([$1], ,1:0.9.2,$1)
   if echo "$tmp" | grep ':' >/dev/null 2>/dev/null ; then
@@ -35,55 +48,60 @@ AC_DEFUN([_AM_PATH_LIBASSUAN_COMMON],
     min_libassuan_version="$tmp"
   fi
 
-  if test "$LIBASSUAN_CONFIG" != "no" ; then
-    libassuan_version=`$LIBASSUAN_CONFIG --version`
-  fi
-  libassuan_version_major=`echo $libassuan_version | \
-               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
-  libassuan_version_minor=`echo $libassuan_version | \
-               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
-  libassuan_version_micro=`echo $libassuan_version | \
-               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\3/'`
-
-  AC_MSG_CHECKING(for LIBASSUAN ifelse([$2], ,,[$2 ])- version >= $min_libassuan_version)
+  AC_MSG_CHECKING(for LIBASSUAN - version >= $min_libassuan_version)
   ok=no
-  if test "$LIBASSUAN_CONFIG" != "no" ; then
-    ifelse([$2], ,,[if `$LIBASSUAN_CONFIG --thread=$2 2> /dev/null` ; then])
+  if test "$LIBASSUAN_CONFIG" != "no"; then
     req_major=`echo $min_libassuan_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\1/'`
     req_minor=`echo $min_libassuan_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
     req_micro=`echo $min_libassuan_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`
-    if test "$libassuan_version_major" -gt "$req_major"; then
+
+    if test -z "$use_gpgrt_config"; then
+      libassuan_config_version=`$LIBASSUAN_CONFIG --version`
+    else
+      libassuan_config_version=`$LIBASSUAN_CONFIG --modversion`
+    fi
+    major=`echo $libassuan_config_version | \
+               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
+    minor=`echo $libassuan_config_version | \
+               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\2/'`
+    micro=`echo $libassuan_config_version | \
+               sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\3/'`
+
+    if test "$major" -gt "$req_major"; then
         ok=yes
-    else 
-        if test "$libassuan_version_major" -eq "$req_major"; then
-            if test "$libassuan_version_minor" -gt "$req_minor"; then
+    else
+        if test "$major" -eq "$req_major"; then
+            if test "$minor" -gt "$req_minor"; then
                ok=yes
             else
-               if test "$libassuan_version_minor" -eq "$req_minor"; then
-                   if test "$libassuan_version_micro" -ge "$req_micro"; then
+               if test "$minor" -eq "$req_minor"; then
+                   if test "$micro" -ge "$req_micro"; then
                      ok=yes
                    fi
                fi
             fi
         fi
     fi
-    ifelse([$2], ,,[fi])
   fi
 
   if test $ok = yes; then
-    AC_MSG_RESULT([yes ($libassuan_version)])
+    AC_MSG_RESULT([yes ($libassuan_config_version)])
   else
     AC_MSG_RESULT(no)
   fi
 
   if test $ok = yes; then
     if test "$req_libassuan_api" -gt 0 ; then
-      tmp=`$LIBASSUAN_CONFIG --api-version 2>/dev/null || echo 0`
+      if test -z "$use_gpgrt_config"; then
+        tmp=`$LIBASSUAN_CONFIG --api-version 2>/dev/null || echo 0`
+      else
+        tmp=`$LIBASSUAN_CONFIG --variable=api_version 2>/dev/null || echo 0`
+      fi
       if test "$tmp" -gt 0 ; then
-        AC_MSG_CHECKING([LIBASSUAN ifelse([$2], ,,[$2 ])API version])
+        AC_MSG_CHECKING([LIBASSUAN API version])
         if test "$req_libassuan_api" -eq "$tmp" ; then
           AC_MSG_RESULT(okay)
         else
@@ -94,6 +112,27 @@ AC_DEFUN([_AM_PATH_LIBASSUAN_COMMON],
     fi
   fi
 
+  if test $ok = yes; then
+    if test x"$host" != x ; then
+      if test -z "$use_gpgrt_config"; then
+        libassuan_config_host=`$LIBASSUAN_CONFIG --host 2>/dev/null || echo none`
+      else
+        libassuan_config_host=`$LIBASSUAN_CONFIG --variable=host 2>/dev/null || echo none`
+      fi
+      if test x"$libassuan_config_host" != xnone ; then
+        if test x"$libassuan_config_host" != x"$host" ; then
+  AC_MSG_WARN([[
+***
+*** The config script "$LIBASSUAN_CONFIG" was
+*** built for $libassuan_config_host and thus may not match the
+*** used host $host.
+*** You may want to use the configure option --with-libassuan-prefix
+*** to specify a matching config script.
+***]])
+        fi
+      fi
+    fi
+  fi
 ])
 
 dnl AM_CHECK_LIBASSUAN([MINIMUM-VERSION,
@@ -120,8 +159,8 @@ dnl
 AC_DEFUN([AM_PATH_LIBASSUAN],
 [ _AM_PATH_LIBASSUAN_COMMON($1)
   if test $ok = yes; then
-    LIBASSUAN_CFLAGS=`$LIBASSUAN_CONFIG $libassuan_config_args --cflags`
-    LIBASSUAN_LIBS=`$LIBASSUAN_CONFIG $libassuan_config_args --libs`
+    LIBASSUAN_CFLAGS=`$LIBASSUAN_CONFIG --cflags`
+    LIBASSUAN_LIBS=`$LIBASSUAN_CONFIG --libs`
     ifelse([$2], , :, [$2])
   else
     LIBASSUAN_CFLAGS=""
@@ -131,45 +170,3 @@ AC_DEFUN([AM_PATH_LIBASSUAN],
   AC_SUBST(LIBASSUAN_CFLAGS)
   AC_SUBST(LIBASSUAN_LIBS)
 ])
-
-
-dnl AM_PATH_LIBASSUAN_PTH([MINIMUM-VERSION,
-dnl                      [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
-dnl Test for libassuan and define LIBASSUAN_PTH_CFLAGS and LIBASSUAN_PTH_LIBS
-dnl
-AC_DEFUN([AM_PATH_LIBASSUAN_PTH],
-[ _AM_PATH_LIBASSUAN_COMMON($1,pth)
-  if test $ok = yes; then
-    LIBASSUAN_PTH_CFLAGS=`$LIBASSUAN_CONFIG $libassuan_config_args --thread=pth --cflags`
-    LIBASSUAN_PTH_LIBS=`$LIBASSUAN_CONFIG $libassuan_config_args --thread=pth --libs`
-    ifelse([$2], , :, [$2])
-  else
-    LIBASSUAN_PTH_CFLAGS=""
-    LIBASSUAN_PTH_LIBS=""
-    ifelse([$3], , :, [$3])
-  fi
-  AC_SUBST(LIBASSUAN_PTH_CFLAGS)
-  AC_SUBST(LIBASSUAN_PTH_LIBS)
-])
-
-
-dnl AM_PATH_LIBASSUAN_PTHREAD([MINIMUM-VERSION,
-dnl                           [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
-dnl Test for libassuan and define LIBASSUAN_PTHREAD_CFLAGS 
-dnl                           and LIBASSUAN_PTHREAD_LIBS
-dnl
-AC_DEFUN([AM_PATH_LIBASSUAN_PTHREAD],
-[ _AM_PATH_LIBASSUAN_COMMON($1,pthread)
-  if test $ok = yes; then
-    LIBASSUAN_PTHREAD_CFLAGS=`$LIBASSUAN_CONFIG $libassuan_config_args --thread=pthread --cflags`
-    LIBASSUAN_PTHREAD_LIBS=`$LIBASSUAN_CONFIG $libassuan_config_args --thread=pthread --libs`
-    ifelse([$2], , :, [$2])
-  else
-    LIBASSUAN_PTHREAD_CFLAGS=""
-    LIBASSUAN_PTHREAD_LIBS=""
-    ifelse([$3], , :, [$3])
-  fi
-  AC_SUBST(LIBASSUAN_PTHREAD_CFLAGS)
-  AC_SUBST(LIBASSUAN_PTHREAD_LIBS)
-])
-
diff --git a/m4/libgcrypt.m4 b/m4/libgcrypt.m4
index d89fe1137..19d514fd5 100644
--- a/m4/libgcrypt.m4
+++ b/m4/libgcrypt.m4
@@ -1,5 +1,5 @@
 # libgcrypt.m4 - Autoconf macros to detect libgcrypt
-# Copyright (C) 2002, 2003, 2004, 2011, 2014 g10 Code GmbH
+# 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
@@ -9,17 +9,17 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 #
-# Last-changed: 2014-10-02
+# 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 MINIMUM-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 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 feature prevents building against newer versions of libgcrypt
+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
@@ -30,14 +30,26 @@ 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}" = x ; then
      if test x"${libgcrypt_config_prefix}" != x ; then
         LIBGCRYPT_CONFIG="${libgcrypt_config_prefix}/bin/libgcrypt-config"
-     else
-       case "${SYSROOT}" in
+     fi
+  fi
+
+  use_gpgrt_config=""
+  if test x"${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"
@@ -48,11 +60,11 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
           *)
            AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
            ;;
-       esac
-     fi
+      esac
+    fi
+    AC_PATH_PROG(LIBGCRYPT_CONFIG, libgcrypt-config, no)
   fi
 
-  AC_PATH_PROG(LIBGCRYPT_CONFIG, libgcrypt-config, no)
   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/'`
@@ -71,7 +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 $libgcrypt_config_version | \
@@ -103,7 +119,11 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
      # If we have a recent libgcrypt, we should also check that the
      # API is compatible
      if test "$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 "$tmp" ; then
@@ -119,12 +139,16 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
     LIBGCRYPT_CFLAGS=`$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
diff --git a/m4/npth.m4 b/m4/npth.m4
index 17c264491..06cdaeefb 100644
--- a/m4/npth.m4
+++ b/m4/npth.m4
@@ -1,5 +1,5 @@
 # npth.m4 - autoconf macro to detect NPTH.
-# Copyright (C) 2002, 2003, 2004, 2011 g10 Code GmbH
+# Copyright (C) 2002, 2003, 2004, 2011, 2018 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
@@ -9,18 +9,35 @@
 # WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
+# Last-changed: 2020-11-17
+
 AC_DEFUN([_AM_PATH_NPTH_CONFIG],
 [ AC_ARG_WITH(npth-prefix,
-            AC_HELP_STRING([--with-npth-prefix=PFX],
+            AS_HELP_STRING([--with-npth-prefix=PFX],
                            [prefix where NPTH is installed (optional)]),
      npth_config_prefix="$withval", npth_config_prefix="")
   if test "x$npth_config_prefix" != x ; then
       NPTH_CONFIG="$npth_config_prefix/bin/npth-config"
   fi
-  AC_PATH_PROG(NPTH_CONFIG, npth-config, no)
+
+  use_gpgrt_config=""
+  if test x"$NPTH_CONFIG" = x -a x"$GPGRT_CONFIG" != x -a "$GPGRT_CONFIG" != "no"; then
+    if $GPGRT_CONFIG npth --exists; then
+      NPTH_CONFIG="$GPGRT_CONFIG npth"
+      AC_MSG_NOTICE([Use gpgrt-config as npth-config])
+      use_gpgrt_config=yes
+    fi
+  fi
+  if test -z "$use_gpgrt_config"; then
+    AC_PATH_PROG(NPTH_CONFIG, npth-config, no)
+  fi
 
   if test "$NPTH_CONFIG" != "no" ; then
-    npth_version=`$NPTH_CONFIG --version`
+    if test -z "$use_gpgrt_config"; then
+      npth_version=`$NPTH_CONFIG --version`
+    else
+      npth_version=`$NPTH_CONFIG --modversion`
+    fi
   fi
   npth_version_major=`echo $npth_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
@@ -70,31 +87,39 @@ AC_DEFUN([AM_PATH_NPTH],
     AC_MSG_RESULT(no)
   fi
   if test $ok = yes; then
-     # If we have a recent NPTH, we should also check that the
-     # API is compatible.
-     if test "$req_npth_api" -gt 0 ; then
+    # If we have a recent NPTH, we should also check that the
+    # API is compatible.
+    if test "$req_npth_api" -gt 0 ; then
+      if test -z "$use_gpgrt_config"; then
         tmp=`$NPTH_CONFIG --api-version 2>/dev/null || echo 0`
-        if test "$tmp" -gt 0 ; then
-           AC_MSG_CHECKING([NPTH API version])
-           if test "$req_npth_api" -eq "$tmp" ; then
-             AC_MSG_RESULT([okay])
-           else
-             ok=no
-             AC_MSG_RESULT([does not match. want=$req_npth_api got=$tmp])
-           fi
+      else
+        tmp=`$NPTH_CONFIG --variable=api_version 2>/dev/null || echo 0`
+      fi
+      if test "$tmp" -gt 0 ; then
+        AC_MSG_CHECKING([NPTH API version])
+        if test "$req_npth_api" -eq "$tmp" ; then
+          AC_MSG_RESULT([okay])
+        else
+          ok=no
+          AC_MSG_RESULT([does not match. want=$req_npth_api got=$tmp])
         fi
-     fi
+      fi
+    fi
   fi
   if test $ok = yes; then
     NPTH_CFLAGS=`$NPTH_CONFIG --cflags`
     NPTH_LIBS=`$NPTH_CONFIG --libs`
     ifelse([$2], , :, [$2])
-    npth_config_host=`$NPTH_CONFIG --host 2>/dev/null || echo none`
+    if test -z "$use_gpgrt_config"; then
+      npth_config_host=`$NPTH_CONFIG --host 2>/dev/null || echo none`
+    else
+      npth_config_host=`$NPTH_CONFIG --variable=host 2>/dev/null || echo none`
+    fi
     if test x"$npth_config_host" != xnone ; then
       if test x"$npth_config_host" != x"$host" ; then
         AC_MSG_WARN([[
 ***
-*** The config script $NPTH_CONFIG was
+*** The config script "$NPTH_CONFIG" was
 *** built for $npth_config_host and thus may not match the
 *** used host $host.
 *** You may want to use the configure option --with-npth-prefix
diff --git a/m4/ntbtls.m4 b/m4/ntbtls.m4
index 0a30d9200..55de48317 100644
--- a/m4/ntbtls.m4
+++ b/m4/ntbtls.m4
@@ -8,45 +8,59 @@ 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.
+dnl
+dnl Last-changed: 2020-11-18
 
 
 dnl AM_PATH_NTBTLS([MINIMUM-VERSION,
 dnl                   [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
 dnl
 dnl Test for NTBTLS and define NTBTLS_CFLAGS and NTBTLS_LIBS.
-dnl MINIMUM-VERSION is a string with the version number optionalliy prefixed
+dnl MINIMUN-VERSION is a string with the version number optionalliy prefixed
 dnl with the API version to also check the API compatibility. Example:
-dnl a MINIMUM-VERSION of 1:1.2.5 won't pass the test unless the installed
-dnl version of ntbtls is at least 1.2.5 *and* the API number is 1.  Using
-dnl this feature prevents building against newer versions of ntbtls
+dnl a MINIMUN-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
 AC_DEFUN([AM_PATH_NTBTLS],
 [ AC_REQUIRE([AC_CANONICAL_HOST])
   AC_ARG_WITH(ntbtls-prefix,
-            AC_HELP_STRING([--with-ntbtls-prefix=PFX],
+            AS_HELP_STRING([--with-ntbtls-prefix=PFX],
                            [prefix where NTBTLS is installed (optional)]),
      ntbtls_config_prefix="$withval", ntbtls_config_prefix="")
   if test x"${NTBTLS_CONFIG}" = x ; then
      if test x"${ntbtls_config_prefix}" != x ; then
         NTBTLS_CONFIG="${ntbtls_config_prefix}/bin/ntbtls-config"
-     else
-       case "${SYSROOT}" in
-         /*)
-           if test -x "${SYSROOT}/bin/ntbtls-config" ; then
-             NTBTLS_CONFIG="${SYSROOT}/bin/ntbtls-config"
-           fi
-           ;;
-         '')
-           ;;
-          *)
-           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
-           ;;
-       esac
      fi
   fi
 
-  AC_PATH_PROG(NTBTLS_CONFIG, ntbtls-config, no)
+  use_gpgrt_config=""
+  if test x"${NTBTLS_CONFIG}" = x -a x"$GPGRT_CONFIG" != x -a "$GPGRT_CONFIG" != "no"; then
+    if $GPGRT_CONFIG ntbtls --exists; then
+      NTBTLS_CONFIG="$GPGRT_CONFIG ntbtls"
+      AC_MSG_NOTICE([Use gpgrt-config as ntbtls-config])
+      use_gpgrt_config=yes
+    fi
+  fi
+  if test -z "$use_gpgrt_config"; then
+    if test x"${NTBTLS_CONFIG}" = x ; then
+      case "${SYSROOT}" in
+        /*)
+          if test -x "${SYSROOT}/bin/ntbtls-config" ; then
+            NTBTLS_CONFIG="${SYSROOT}/bin/ntbtls-config"
+          fi
+          ;;
+        '')
+          ;;
+         *)
+          AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
+          ;;
+      esac
+    fi
+    AC_PATH_PROG(NTBTLS_CONFIG, ntbtls-config, no)
+  fi
+
   tmp=ifelse([$1], ,1:1.0.0,$1)
   if echo "$tmp" | grep ':' >/dev/null 2>/dev/null ; then
      req_ntbtls_api=`echo "$tmp"     | sed 's/\(.*\):\(.*\)/\1/'`
@@ -65,7 +79,11 @@ AC_DEFUN([AM_PATH_NTBTLS],
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\2/'`
     req_micro=`echo $min_ntbtls_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\)/\3/'`
-    ntbtls_config_version=`$NTBTLS_CONFIG --version`
+    if test -z "$use_gpgrt_config"; then
+      ntbtls_config_version=`$NTBTLS_CONFIG --version`
+    else
+      ntbtls_config_version=`$NTBTLS_CONFIG --modversion`
+    fi
     major=`echo $ntbtls_config_version | \
                sed 's/\([[0-9]]*\)\.\([[0-9]]*\)\.\([[0-9]]*\).*/\1/'`
     minor=`echo $ntbtls_config_version | \
@@ -97,7 +115,11 @@ AC_DEFUN([AM_PATH_NTBTLS],
      # If we have a recent ntbtls, we should also check that the
      # API is compatible
      if test "$req_ntbtls_api" -gt 0 ; then
-        tmp=`$NTBTLS_CONFIG --api-version 2>/dev/null || echo 0`
+        if test -z "$use_gpgrt_config"; then
+          tmp=`$NTBTLS_CONFIG --api-version 2>/dev/null || echo 0`
+        else
+          tmp=`$NTBTLS_CONFIG --variable=api_version 2>/dev/null || echo 0`
+	fi
         if test "$tmp" -gt 0 ; then
            AC_MSG_CHECKING([NTBTLS API version])
            if test "$req_ntbtls_api" -eq "$tmp" ; then
@@ -113,12 +135,16 @@ AC_DEFUN([AM_PATH_NTBTLS],
     NTBTLS_CFLAGS=`$NTBTLS_CONFIG --cflags`
     NTBTLS_LIBS=`$NTBTLS_CONFIG --libs`
     ifelse([$2], , :, [$2])
-    ntbtls_config_host=`$NTBTLS_CONFIG --host 2>/dev/null || echo none`
+    if test -z "$use_gpgrt_config"; then
+      ntbtls_config_host=`$NTBTLS_CONFIG --host 2>/dev/null || echo none`
+    else
+      ntbtls_config_host=`$NTBTLS_CONFIG --variable=host 2>/dev/null || echo none`
+    fi
     if test x"$ntbtls_config_host" != xnone ; then
       if test x"$ntbtls_config_host" != x"$host" ; then
   AC_MSG_WARN([[
 ***
-*** The config script $NTBTLS_CONFIG was
+*** The config script "$NTBTLS_CONFIG" was
 *** built for $ntbtls_config_host and thus may not match the
 *** used host $host.
 *** You may want to use the configure option --with-ntbtls-prefix