diff --git a/configure.ac b/configure.ac
index 5da6ea55d..7137e3f6c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -460,6 +460,7 @@ AH_BOTTOM([
 
 
 AM_MAINTAINER_MODE
+AC_ARG_VAR(SYSROOT,[locate config scripts also below that directory])
 
 # Checks for programs.
 AC_MSG_NOTICE([checking for programs])
@@ -1613,3 +1614,12 @@ echo "
                  gpg-check-pattern will not be build.
 "
 fi
+if test "x${gpg_config_script_warn}" != x; then
+cat <<G10EOF
+        Warning: Mismatches between the target platform and the
+                 to be used libraries have been detected for:
+                  ${gpg_config_script_warn}
+                 Please check above for more warning messages.
+
+G10EOF
+fi
diff --git a/m4/gpg-error.m4 b/m4/gpg-error.m4
index feb963c6e..1661204c2 100644
--- a/m4/gpg-error.m4
+++ b/m4/gpg-error.m4
@@ -1,5 +1,5 @@
 # gpg-error.m4 - autoconf macro to detect libgpg-error.
-# Copyright (C) 2002, 2003, 2004, 2011 g10 Code GmbH
+# Copyright (C) 2002, 2003, 2004, 2011, 2014 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
@@ -8,10 +8,21 @@
 # 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: 2014-10-02
+
 
 dnl AM_PATH_GPG_ERROR([MINIMUM-VERSION,
 dnl                   [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND ]]])
-dnl Test for libgpg-error and define GPG_ERROR_CFLAGS and GPG_ERROR_LIBS
+dnl
+dnl Test for libgpg-error and define GPG_ERROR_CFLAGS, GPG_ERROR_LIBS,
+dnl GPG_ERROR_MT_CFLAGS, and GPG_ERROR_MT_LIBS.  The _MT_ variants are
+dnl used for programs requireing real multi thread support.
+dnl
+dnl If a prefix option is not used, the config script is first
+dnl searched in $SYSROOT/bin and then along $PATH.  If the used
+dnl config script does not match the host specification the script
+dnl is added to the gpg_config_script_warn variable.
 dnl
 AC_DEFUN([AM_PATH_GPG_ERROR],
 [ AC_REQUIRE([AC_CANONICAL_HOST])
@@ -30,13 +41,26 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
   AC_ARG_WITH(gpg-error-prefix,,
               [gpg_error_config_prefix="$withval"])
 
-  if test x$gpg_error_config_prefix != x ; then
-     if test x${GPG_ERROR_CONFIG+set} != xset ; then
-        GPG_ERROR_CONFIG=$gpg_error_config_prefix/bin/gpg-error-config
+  if test x"${GPG_ERROR_CONFIG}" = x ; then
+     if test x"${gpg_error_config_prefix}" != x ; then
+        GPG_ERROR_CONFIG="${gpg_error_config_prefix}/bin/gpg-error-config"
+     else
+       case "${SYSROOT}" in
+         /*)
+           if test -x "${SYSROOT}/bin/gpg-error-config" ; then
+             GPG_ERROR_CONFIG="${SYSROOT}/bin/gpg-error-config"
+           fi
+           ;;
+         '')
+           ;;
+          *)
+           AC_MSG_WARN([Ignoring \$SYSROOT as it is not an absolute path.])
+           ;;
+       esac
      fi
   fi
 
-  AC_PATH_TOOL(GPG_ERROR_CONFIG, gpg-error-config, no)
+  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)
   ok=no
@@ -64,6 +88,8 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
   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 $gpg_error_config_args --mt --libs 2>/dev/null`
     AC_MSG_RESULT([yes ($gpg_error_config_version)])
     ifelse([$2], , :, [$2])
     gpg_error_config_host=`$GPG_ERROR_CONFIG $gpg_error_config_args --host 2>/dev/null || echo none`
@@ -75,16 +101,21 @@ AC_DEFUN([AM_PATH_GPG_ERROR],
 *** built for $gpg_error_config_host and thus may not match the
 *** used host $host.
 *** You may want to use the configure option --with-gpg-error-prefix
-*** to specify a matching config script.
+*** to specify a matching config script or use \$SYSROOT.
 ***]])
+        gpg_config_script_warn="$gpg_config_script_warn libgpg-error"
       fi
     fi
   else
     GPG_ERROR_CFLAGS=""
     GPG_ERROR_LIBS=""
+    GPG_ERROR_MT_CFLAGS=""
+    GPG_ERROR_MT_LIBS=""
     AC_MSG_RESULT(no)
     ifelse([$3], , :, [$3])
   fi
   AC_SUBST(GPG_ERROR_CFLAGS)
   AC_SUBST(GPG_ERROR_LIBS)
+  AC_SUBST(GPG_ERROR_MT_CFLAGS)
+  AC_SUBST(GPG_ERROR_MT_LIBS)
 ])
diff --git a/m4/libgcrypt.m4 b/m4/libgcrypt.m4
index 6cf482fcb..c67cfecef 100644
--- a/m4/libgcrypt.m4
+++ b/m4/libgcrypt.m4
@@ -1,13 +1,15 @@
-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 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: 2014-10-02
 
 
 dnl AM_PATH_LIBGCRYPT([MINIMUM-VERSION,
@@ -20,19 +22,37 @@ 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 $PATH.  If the used
+dnl config script does not match the host specification the script
+dnl is added to the gpg_config_script_warn variable.
+dnl
 AC_DEFUN([AM_PATH_LIBGCRYPT],
 [ AC_REQUIRE([AC_CANONICAL_HOST])
   AC_ARG_WITH(libgcrypt-prefix,
             AC_HELP_STRING([--with-libgcrypt-prefix=PFX],
                            [prefix where LIBGCRYPT is installed (optional)]),
      libgcrypt_config_prefix="$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"
+     else
+       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
   fi
 
-  AC_PATH_TOOL(LIBGCRYPT_CONFIG, libgcrypt-config, no)
+  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/'`
@@ -108,8 +128,9 @@ AC_DEFUN([AM_PATH_LIBGCRYPT],
 *** 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