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diff --git a/autoconf/ax_lib_expat.m4 b/autoconf/ax_lib_expat.m4
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+++ b/autoconf/ax_lib_expat.m4
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+# ===========================================================================
+#              http://autoconf-archive.cryp.to/ax_lib_expat.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_LIB_EXPAT([MINIMUM-VERSION])
+#
+# DESCRIPTION
+#
+#   This macro provides tests of availability of Expat XML Parser of
+#   particular version or newer. This macro checks for Expat XML Parser
+#   headers and libraries and defines compilation flags
+#
+#   Macro supports following options and their values:
+#
+#   1) Single-option usage:
+#
+#     --with-expat      -- yes, no, or path to Expat XML Parser
+#                          installation prefix
+#
+#   2) Three-options usage (all options are required):
+#
+#     --with-expat=yes
+#     --with-expat-inc  -- path to base directory with Expat headers
+#     --with-expat-lib  -- linker flags for Expat
+#
+#   This macro calls:
+#
+#     AC_SUBST(EXPAT_CFLAGS)
+#     AC_SUBST(EXPAT_LDFLAGS)
+#     AC_SUBST(EXPAT_VERSION)  -- only if version requirement is used
+#
+#   And sets:
+#
+#     HAVE_EXPAT
+#
+# LAST MODIFICATION
+#
+#   2008-04-12
+#
+# COPYLEFT
+#
+#   Copyright (c) 2008 Mateusz Loskot <mateusz@loskot.net>
+#
+#   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.
+
+AC_DEFUN([AX_LIB_EXPAT],
+[
+    AC_ARG_WITH([expat],
+        AC_HELP_STRING([--with-expat=@<:@ARG@:>@],
+            [use Expat XML Parser from given prefix (ARG=path); check standard prefixes (ARG=yes); disable (ARG=no)]
+        ),
+        [
+        if test "$withval" = "yes"; then
+            if test -f /usr/local/include/expat.h ; then
+                expat_prefix=/usr/local
+            elif test -f /usr/include/expat.h ; then
+                expat_prefix=/usr
+            else
+                expat_prefix=""
+            fi
+            expat_requested="yes"
+        elif test -d "$withval"; then
+            expat_prefix="$withval"
+            expat_requested="yes"
+        else
+            expat_prefix=""
+            expat_requested="no"
+        fi
+        ],
+        [
+        dnl Default behavior is implicit yes
+        if test -f /usr/local/include/expat.h ; then
+            expat_prefix=/usr/local
+        elif test -f /usr/include/expat.h ; then
+            expat_prefix=/usr
+        else
+            expat_prefix=""
+        fi
+        ]
+    )
+
+    AC_ARG_WITH([expat-inc],
+        AC_HELP_STRING([--with-expat-inc=@<:@DIR@:>@],
+            [path to Expat XML Parser headers]
+        ),
+        [expat_include_dir="$withval"],
+        [expat_include_dir=""]
+    )
+    AC_ARG_WITH([expat-lib],
+        AC_HELP_STRING([--with-expat-lib=@<:@ARG@:>@],
+            [link options for Expat XML Parser libraries]
+        ),
+        [expat_lib_flags="$withval"],
+        [expat_lib_flags=""]
+    )
+
+    EXPAT_CFLAGS=""
+    EXPAT_LDFLAGS=""
+    EXPAT_VERSION=""
+
+    dnl
+    dnl Collect include/lib paths and flags
+    dnl
+    run_expat_test="no"
+
+    if test -n "$expat_prefix"; then
+        expat_include_dir="$expat_prefix/include"
+        expat_lib_flags="-L$expat_prefix/lib"
+        expat_libs="-lexpat"
+        run_expat_test="yes"
+    elif test "$expat_requested" = "yes"; then
+        if test -n "$expat_include_dir" -a -n "$expat_lib_flags"; then
+            run_expat_test="yes"
+        fi
+    else
+        run_expat_test="no"
+    fi
+
+    dnl
+    dnl Check Expat XML Parser files
+    dnl
+    if test "$run_expat_test" = "yes"; then
+
+        saved_CPPFLAGS="$CPPFLAGS"
+        CPPFLAGS="$CPPFLAGS -I$expat_include_dir"
+
+        saved_LDFLAGS="$LDFLAGS"
+        LDFLAGS="$LDFLAGS $expat_lib_flags"
+        LIBS="$LIBS $expat_libs"
+
+        dnl
+        dnl Check Expat headers
+        dnl
+        AC_MSG_CHECKING([for Expat XML Parser headers in $expat_include_dir])
+
+        AC_LANG_PUSH([C++])
+        AC_COMPILE_IFELSE([
+            AC_LANG_PROGRAM(
+                [[
+@%:@include <expat.h>
+                ]],
+                [[]]
+            )],
+            [
+            EXPAT_CFLAGS="-I$expat_include_dir"
+            expat_header_found="yes"
+            AC_MSG_RESULT([found])
+            ],
+            [
+            expat_header_found="no"
+            AC_MSG_RESULT([not found])
+            ]
+        )
+        AC_LANG_POP([C++])
+
+        dnl
+        dnl Check Expat libraries
+        dnl
+        if test "$expat_header_found" = "yes"; then
+
+            AC_MSG_CHECKING([for Expat XML Parser libraries])
+
+            AC_LANG_PUSH([C++])
+            AC_LINK_IFELSE([
+                AC_LANG_PROGRAM(
+                    [[
+@%:@include <expat.h>
+                    ]],
+                    [[
+XML_Parser p = XML_ParserCreate(NULL);
+XML_ParserFree(p);
+p = NULL;
+                    ]]
+                )],
+                [
+                EXPAT_LDFLAGS="$expat_lib_flags"
+                EXPAT_LIBS="$expat_libs"
+                expat_lib_found="yes"
+                AC_MSG_RESULT([found])
+                ],
+                [
+                expat_lib_found="no"
+                AC_MSG_RESULT([not found])
+                ]
+            )
+            AC_LANG_POP([C++])
+        fi
+
+        CPPFLAGS="$saved_CPPFLAGS"
+        LDFLAGS="$saved_LDFLAGS"
+    fi
+
+    AC_MSG_CHECKING([for Expat XML Parser])
+
+    if test "$run_expat_test" = "yes"; then
+        if test "$expat_header_found" = "yes" -a "$expat_lib_found" = "yes"; then
+
+            AC_SUBST([EXPAT_CFLAGS])
+            AC_SUBST([EXPAT_LDFLAGS])
+
+            HAVE_EXPAT="yes"
+        else
+            HAVE_EXPAT="no"
+        fi
+
+        AC_MSG_RESULT([$HAVE_EXPAT])
+
+        dnl
+        dnl Check Expat version
+        dnl
+        if test "$HAVE_EXPAT" = "yes"; then
+
+            expat_version_req=ifelse([$1], [], [], [$1])
+
+            if test  -n "$expat_version_req"; then
+
+                AC_MSG_CHECKING([if Expat XML Parser version is >= $expat_version_req])
+
+                if test -f "$expat_include_dir/expat.h"; then
+
+                    expat_major=`cat $expat_include_dir/expat.h | \
+                                    grep '^#define.*XML_MAJOR_VERSION.*[0-9]$' | \
+                                    sed -e 's/#define XML_MAJOR_VERSION.//'`
+
+                    expat_minor=`cat $expat_include_dir/expat.h | \
+                                    grep '^#define.*XML_MINOR_VERSION.*[0-9]$' | \
+                                    sed -e 's/#define XML_MINOR_VERSION.//'`
+
+                    expat_revision=`cat $expat_include_dir/expat.h | \
+                                    grep '^#define.*XML_MICRO_VERSION.*[0-9]$' | \
+                                    sed -e 's/#define XML_MICRO_VERSION.//'`
+
+                    EXPAT_VERSION="$expat_major.$expat_minor.$expat_revision"
+                    AC_SUBST([EXPAT_VERSION])
+
+                    dnl Decompose required version string and calculate numerical representation
+                    expat_version_req_major=`expr $expat_version_req : '\([[0-9]]*\)'`
+                    expat_version_req_minor=`expr $expat_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
+                    expat_version_req_revision=`expr $expat_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
+                    if test "x$expat_version_req_revision" = "x"; then
+                        expat_version_req_revision="0"
+                    fi
+
+                    expat_version_req_number=`expr $expat_version_req_major \* 10000 \
+                                               \+ $expat_version_req_minor \* 100 \
+                                               \+ $expat_version_req_revision`
+
+                    dnl Calculate numerical representation of detected version
+                    expat_version_number=`expr $expat_major \* 10000 \
+                                          \+ $expat_minor \* 100 \
+                                           \+ $expat_revision`
+
+                    expat_version_check=`expr $expat_version_number \>\= $expat_version_req_number`
+                    if test "$expat_version_check" = "1"; then
+                        AC_MSG_RESULT([yes])
+                    else
+                        AC_MSG_RESULT([no])
+                        AC_MSG_WARN([Found Expat XML Parser $EXPAT_VERSION, which is older than required. Possible compilation failure.])
+                    fi
+                else
+                    AC_MSG_RESULT([no])
+                    AC_MSG_WARN([Missing expat.h header. Unable to determine Expat version.])
+                fi
+            fi
+        fi
+
+    else
+        HAVE_EXPAT="no"
+        AC_MSG_RESULT([$HAVE_EXPAT])
+
+        if test "$expat_requested" = "yes"; then
+            AC_MSG_WARN([Expat XML Parser support requested but headers or library not found. Specify valid prefix of Expat using --with-expat=@<:@DIR@:>@ or provide include directory and linker flags using --with-expat-inc and --with-expat-lib])
+        fi
+    fi
+])