Add libxml2 and libxslt detection using pkg-config.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 75760d5c71)

configure.in.in

@@ -40,6 +40,11 @@ dnl the ability to specify the location of the libxml
 dnl library during linking and compilation.
 dnl Mathieu Lacage 30/03/2000
 dnl
+
+KDE_PKG_CHECK_MODULES(LIBXML, libxml-2.0,
+    have_libxml=yes, have_libxml=no)
+
+if test "x$have_libxml" != "xyes"; then
     LIBXML_PREFIX=""
     AC_ARG_WITH(libxml-prefix,
         [  --with-libxml-prefix=[PFX]     Specify location of libxml],
@@ -51,9 +56,6 @@ then
       AC_MSG_RESULT(Using a libxml prefix of ${LIBXML_PREFIX})
     fi
 
-
-AC_SUBST(LIBXML_LIBS)
-
     dnl Test for libxml2 version
     XML_CONFIG="xml2-config"
     AC_MSG_CHECKING(for libxml libraries >= "2.6.0")
@@ -99,14 +101,16 @@ then
     !!Warning!! using xml2-config in default path
     )
     fi
+fi
 
-LIBXML_PREFIX_DIR="`$XML_CONFIG --prefix`"
-
-AC_SUBST(XML_CONFIG)
-AC_SUBST(LIBXML_PREFIX)
 AC_SUBST(LIBXML_LIBS)
 AC_SUBST(LIBXML_CFLAGS)
 
+
+KDE_PKG_CHECK_MODULES(LIBXSLT, libexslt,
+    have_libexslt=yes, have_libexslt=no)
+
+if test "x$have_libexslt" != "xyes"; then
     LIBXSLT_PREFIX=""
     AC_ARG_WITH(libxslt-prefix,
             [  --with-libxslt-prefix=[PFX]    Specify location of libxslt],
@@ -175,9 +179,8 @@ then
     !!Warning!! using xslt-config in default path
     )
     fi
+fi
 
-AC_SUBST(XSLT_CONFIG)
-AC_SUBST(LIBXSLT_PREFIX)
 AC_SUBST(LIBXSLT_LIBS)
 AC_SUBST(LIBXSLT_CFLAGS)