Add libxslt detection using pkg-config.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 59f924fd38)

kipi-plugins/configure.in.in

@@ -334,14 +334,21 @@ fi
 have_xslt=no
 
 if test "x$build_xslt" != "xno"; then
-  AC_PATH_PROG(XSLT_CONFIG,xslt-config)
-  if test -n "${XSLT_CONFIG}"; then
-    LIBXSLT_CFLAGS="`$XSLT_CONFIG --cflags`"
-    AC_SUBST(LIBXSLT_CFLAGS)
-    LIBXSLT_LIBS="`$XSLT_CONFIG --libs`"
-    AC_SUBST(LIBXSLT_LIBS)
-    have_xslt=yes
-  else
+  KDE_PKG_CHECK_MODULES(LIBXSLT, libxslt,
+    have_xslt=yes, have_xslt=no)
+
+  if test "x$have_xslt" != "xyes"; then
+    AC_PATH_PROG(XSLT_CONFIG,xslt-config)
+    if test -n "${XSLT_CONFIG}"; then
+      LIBXSLT_CFLAGS="`$XSLT_CONFIG --cflags`"
+      AC_SUBST(LIBXSLT_CFLAGS)
+      LIBXSLT_LIBS="`$XSLT_CONFIG --libs`"
+      AC_SUBST(LIBXSLT_LIBS)
+      have_xslt=yes
+    fi
+  fi
+
+  if test "x$have_xslt" != "xyes"; then
     AC_MSG_WARN([libxslt library not found, some plugins will not be compiled])
   fi
 fi