diff --git a/include/xo/interpreter2/VsmConfig.hpp b/include/xo/interpreter2/VsmConfig.hpp
index bfd6dbf6..166a63dd 100644
--- a/include/xo/interpreter2/VsmConfig.hpp
+++ b/include/xo/interpreter2/VsmConfig.hpp
@@ -31,6 +31,12 @@ namespace xo {
                 return retval;
             }
 
+            VsmConfig with_x1_debug_flag(bool x) const {
+                VsmConfig retval = *this;
+                retval.x1_config_.debug_flag_ = x;
+                return retval;
+            }
+
             /** true for interactive parser session; false for batch session **/
             bool interactive_flag_ = true;
 
diff --git a/src/interpreter2/VirtualSchematikaMachine.cpp b/src/interpreter2/VirtualSchematikaMachine.cpp
index 5633c7d0..37f24390 100644
--- a/src/interpreter2/VirtualSchematikaMachine.cpp
+++ b/src/interpreter2/VirtualSchematikaMachine.cpp
@@ -86,6 +86,8 @@ namespace xo {
             }
 
             this->global_env_ = reader_.global_env();
+
+            //this->_add_gc_roots();
         }
 
         obj<AAllocator>
diff --git a/src/interpreter2/init_interpreter2.cpp b/src/interpreter2/init_interpreter2.cpp
index 77b997d2..56630794 100644
--- a/src/interpreter2/init_interpreter2.cpp
+++ b/src/interpreter2/init_interpreter2.cpp
@@ -7,6 +7,7 @@
 #include "SetupInterpreter2.hpp"
 
 #include <xo/reader2/init_reader2.hpp>
+#include <xo/gc/init_gc.hpp>
 #include <xo/alloc2/CollectorTypeRegistry.hpp>
 
 namespace xo {
@@ -31,6 +32,7 @@ namespace xo {
 
         /* direct subsystem deps for xo-interpreter2/ */
         retval ^= InitSubsys<S_reader2_tag>::require();
+        retval ^= InitSubsys<S_gc_tag>::require();
 
         /* xo-interpreter2/'s own initialization code */
         retval ^= Subsystem::provide<S_interpreter2_tag>("interpreter2", &init);