Index: trunk/zoo-project/zoo-kernel/configure.ac
===================================================================
--- trunk/zoo-project/zoo-kernel/configure.ac	(revision 952)
+++ trunk/zoo-project/zoo-kernel/configure.ac	(revision 953)
@@ -72,5 +72,5 @@
     [AS_HELP_STRING([--with-json=PATH], [Specifies an alternative location for the json-c library])],
     [JSON_DIR="$withval"], [JSON_DIR="/usr/"])
-if test "x$JSON_DIR" != "x" && test "x$CALLBACK_ACTIVATED" == "xyes"
+if test "x$JSON_DIR" != "x"
 then
 	JSON_CPPFLAGS="-DUSE_JSON -I$JSON_DIR/include/json-c/"