diff --git a/cmake/xo_interpreter2Config.cmake.in b/cmake/xo_interpreter2Config.cmake.in
index bea8e9cc..3310d075 100644
--- a/cmake/xo_interpreter2Config.cmake.in
+++ b/cmake/xo_interpreter2Config.cmake.in
@@ -10,4 +10,5 @@ find_dependency(xo_expression2)
 find_dependency(xo_gc)
 
 include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
+include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Share.cmake")
 check_required_components("@PROJECT_NAME@")
diff --git a/include/xo/interpreter2/VirtualSchematikaMachine.hpp b/include/xo/interpreter2/VirtualSchematikaMachine.hpp
index 75fb968f..0df50ced 100644
--- a/include/xo/interpreter2/VirtualSchematikaMachine.hpp
+++ b/include/xo/interpreter2/VirtualSchematikaMachine.hpp
@@ -15,6 +15,7 @@
 #include <xo/expression2/Expression.hpp>
 #include <xo/gc/GCObject.hpp>
 #include <xo/alloc2/abox.hpp>
+#include <variant>
 
 namespace xo {
     namespace scm {
@@ -91,7 +92,7 @@ namespace xo {
             /** allocator for runtime errors **/
             obj<AAllocator> error_allocator() const noexcept;
 
-            /** true iff parser is at top-level -> does not contain 
+            /** true iff parser is at top-level -> does not contain
              *  state for a incomplete/partial expression
              **/
             bool is_at_toplevel() const noexcept;