diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1735dd5..09ebb96 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,7 +48,7 @@ xo_add_genfacetimpl(
 # note: manual target; generated code committed to git
 xo_add_genfacetimpl(
     TARGET xo-object2-facetimpl-gcobject-list
-    FACET_PKG xo_gc
+    FACET_PKG xo_alloc2
     FACET GCObject
     REPR List
     INPUT idl/IGCObject_DList.json5
@@ -68,7 +68,7 @@ xo_add_genfacetimpl(
 # note: manual target; generated code committed to git
 xo_add_genfacetimpl(
     TARGET xo-object2-facetimpl-gcobject-boolean
-    FACET_PKG xo_gc
+    FACET_PKG xo_alloc2
     FACET GCObject
     REPR Boolean
     INPUT idl/IGCObject_DBoolean.json5
@@ -88,7 +88,7 @@ xo_add_genfacetimpl(
 # note: manual target; generated code committed to git
 xo_add_genfacetimpl(
     TARGET xo-object2-facetimpl-gcobject-float
-    FACET_PKG xo_gc
+    FACET_PKG xo_alloc2
     FACET GCObject
     REPR Float
     INPUT idl/IGCObject_DFloat.json5
@@ -108,7 +108,7 @@ xo_add_genfacetimpl(
 # note: manual target; generated code committed to git
 xo_add_genfacetimpl(
     TARGET xo-object2-facetimpl-gcobject-integer
-    FACET_PKG xo_gc
+    FACET_PKG xo_alloc2
     FACET GCObject
     REPR Integer
     INPUT idl/IGCObject_DInteger.json5
@@ -137,7 +137,7 @@ xo_add_genfacetimpl(
 # note: manual target; generated code committed to git
 xo_add_genfacetimpl(
     TARGET xo-object2-facetimpl-gcobject-array
-    FACET_PKG xo_gc
+    FACET_PKG xo_alloc2
     FACET GCObject
     REPR Array
     INPUT idl/IGCObject_DArray.json5
@@ -157,7 +157,7 @@ xo_add_genfacetimpl(
 # note: manual target; generated code committed to git
 xo_add_genfacetimpl(
     TARGET xo-object2-facetimpl-gcobject-dictionary
-    FACET_PKG xo_gc
+    FACET_PKG xo_alloc2
     FACET GCObject
     REPR Dictionary
     INPUT idl/IGCObject_DDictionary.json5
@@ -177,7 +177,7 @@ xo_add_genfacetimpl(
 # note: manual target; generated code committed to git
 xo_add_genfacetimpl(
     TARGET xo-object2-facetimpl-gcobject-runtimeerror
-    FACET_PKG xo_gc
+    FACET_PKG xo_alloc2
     FACET GCObject
     REPR RuntimeError
     INPUT idl/IGCObject_DRuntimeError.json5
diff --git a/cmake/xo_object2Config.cmake.in b/cmake/xo_object2Config.cmake.in
index 78ee9e0..b34f76f 100644
--- a/cmake/xo_object2Config.cmake.in
+++ b/cmake/xo_object2Config.cmake.in
@@ -2,8 +2,8 @@
 
 include(CMakeFindDependencyMacro)
 find_dependency(reflect)
-find_dependency(xo_gc)
 find_dependency(xo_stringtable2)
+find_dependency(xo_alloc2)
 find_dependency(xo_printable2)
 find_dependency(subsys)
 find_dependency(indentlog)
diff --git a/idl/IGCObject_DArray.json5 b/idl/IGCObject_DArray.json5
index bef5bd6..96507a7 100644
--- a/idl/IGCObject_DArray.json5
+++ b/idl/IGCObject_DArray.json5
@@ -4,7 +4,7 @@
     output_hpp_dir: "include/xo/object2",
     output_impl_subdir: "array",
     includes: [
-        "<xo/gc/GCObject.hpp>",
+        "<xo/alloc2/GCObject.hpp>",
         "<xo/alloc2/Allocator.hpp>"
     ],
     local_types: [ ],
diff --git a/idl/IGCObject_DBoolean.json5 b/idl/IGCObject_DBoolean.json5
index c9aaf26..c739ccd 100644
--- a/idl/IGCObject_DBoolean.json5
+++ b/idl/IGCObject_DBoolean.json5
@@ -4,8 +4,8 @@
     output_hpp_dir: "include/xo/object2",
     output_impl_subdir: "boolean",
     includes: [
-        "<xo/gc/GCObject.hpp>",
-        "<xo/alloc2/Allocator.hpp>"
+//        "<xo/alloc2/GCObject.hpp>",
+//        "<xo/alloc2/Allocator.hpp>"
     ],
     local_types: [ ],
     namespace1: "xo",
diff --git a/idl/IGCObject_DDictionary.json5 b/idl/IGCObject_DDictionary.json5
index 636413b..ebf8fd8 100644
--- a/idl/IGCObject_DDictionary.json5
+++ b/idl/IGCObject_DDictionary.json5
@@ -4,7 +4,7 @@
     output_hpp_dir: "include/xo/object2",
     output_impl_subdir: "dictionary",
     includes: [
-        "<xo/gc/GCObject.hpp>",
+        "<xo/alloc2/GCObject.hpp>",
         "<xo/alloc2/Allocator.hpp>"
     ],
     local_types: [ ],
diff --git a/idl/IGCObject_DFloat.json5 b/idl/IGCObject_DFloat.json5
index eec1e3e..2255f41 100644
--- a/idl/IGCObject_DFloat.json5
+++ b/idl/IGCObject_DFloat.json5
@@ -5,7 +5,7 @@
     output_impl_subdir: "number",
     includes: [
         "<xo/object2/number/GCObjectConversion_DFloat.hpp>",
-        "<xo/gc/GCObject.hpp>",
+        "<xo/alloc2/GCObject.hpp>",
         "<xo/alloc2/Allocator.hpp>"
     ],
     local_types: [ ],
diff --git a/idl/IGCObject_DInteger.json5 b/idl/IGCObject_DInteger.json5
index 37d603e..1809330 100644
--- a/idl/IGCObject_DInteger.json5
+++ b/idl/IGCObject_DInteger.json5
@@ -4,7 +4,7 @@
     output_hpp_dir: "include/xo/object2",
     output_impl_subdir: "number",
     includes: [
-        "<xo/gc/GCObject.hpp>",
+        "<xo/alloc2/GCObject.hpp>",
         "<xo/alloc2/Allocator.hpp>"
     ],
     local_types: [ ],
diff --git a/idl/IGCObject_DList.json5 b/idl/IGCObject_DList.json5
index 28fb335..ecb4898 100644
--- a/idl/IGCObject_DList.json5
+++ b/idl/IGCObject_DList.json5
@@ -4,7 +4,7 @@
     output_hpp_dir: "include/xo/object2",
     output_impl_subdir: "list",
     includes: [
-//        "<xo/gc/GCObject.hpp>",
+//        "<xo/alloc2/GCObject.hpp>",
 //        "<xo/alloc2/Allocator.hpp>"
     ],
     local_types: [ ],
diff --git a/idl/IGCObject_DRuntimeError.json5 b/idl/IGCObject_DRuntimeError.json5
index cfcbe9f..a0e1504 100644
--- a/idl/IGCObject_DRuntimeError.json5
+++ b/idl/IGCObject_DRuntimeError.json5
@@ -4,7 +4,7 @@
     output_hpp_dir: "include/xo/object2",
     output_impl_subdir: "error",
     includes: [
-//        "<xo/gc/GCObject.hpp>",
+//        "<xo/alloc2/GCObject.hpp>",
 //        "<xo/alloc2/Allocator.hpp>"
     ],
     local_types: [ ],
diff --git a/idl/Sequence.json5 b/idl/Sequence.json5
index 2027169..0b022f0 100644
--- a/idl/Sequence.json5
+++ b/idl/Sequence.json5
@@ -3,7 +3,7 @@
     output_cpp_dir: "src/object2",
     output_hpp_dir: "include/xo/object2",
     output_impl_subdir: "sequence",
-    includes: ["<xo/gc/GCObject.hpp>"],
+    includes: ["<xo/alloc2/GCObject.hpp>"],
     // extra includes in Sequence.hpp, if any
     user_hpp_includes: [],
     namespace1: "xo",
diff --git a/include/xo/object2/array/IGCObject_DArray.hpp b/include/xo/object2/array/IGCObject_DArray.hpp
index 08f78aa..6eb571e 100644
--- a/include/xo/object2/array/IGCObject_DArray.hpp
+++ b/include/xo/object2/array/IGCObject_DArray.hpp
@@ -64,4 +64,4 @@ namespace xo {
     } /*namespace scm*/
 } /*namespace xo*/
 
-/* end */
+/* end */
\ No newline at end of file
diff --git a/include/xo/object2/boolean/IGCObject_DBoolean.hpp b/include/xo/object2/boolean/IGCObject_DBoolean.hpp
index 358aad1..9afd964 100644
--- a/include/xo/object2/boolean/IGCObject_DBoolean.hpp
+++ b/include/xo/object2/boolean/IGCObject_DBoolean.hpp
@@ -14,8 +14,6 @@
 #pragma once
 
 #include "GCObject.hpp"
-#include <xo/alloc2/GCObject.hpp>
-#include <xo/alloc2/Allocator.hpp>
 #include "DBoolean.hpp"
 
 namespace xo { namespace scm { class IGCObject_DBoolean; } }
@@ -64,4 +62,4 @@ namespace xo {
     } /*namespace scm*/
 } /*namespace xo*/
 
-/* end */
+/* end */
\ No newline at end of file
diff --git a/include/xo/object2/dictionary/IGCObject_DDictionary.hpp b/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
index 7fe1bc5..2d69f99 100644
--- a/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
+++ b/include/xo/object2/dictionary/IGCObject_DDictionary.hpp
@@ -64,4 +64,4 @@ namespace xo {
     } /*namespace scm*/
 } /*namespace xo*/
 
-/* end */
+/* end */
\ No newline at end of file
diff --git a/include/xo/object2/number/GCObjectConversion_DFloat.hpp b/include/xo/object2/number/GCObjectConversion_DFloat.hpp
index 959eeca..4cc4751 100644
--- a/include/xo/object2/number/GCObjectConversion_DFloat.hpp
+++ b/include/xo/object2/number/GCObjectConversion_DFloat.hpp
@@ -7,7 +7,7 @@
 
 #include "DFloat.hpp"
 #include "number/IGCObject_DFloat.hpp"
-#include <xo/gc/GCObjectConversion.hpp>
+#include <xo/alloc2/GCObjectConversion.hpp>
 
 namespace xo {
     namespace scm {
diff --git a/include/xo/object2/number/GCObjectConversion_DInteger.hpp b/include/xo/object2/number/GCObjectConversion_DInteger.hpp
index 458312c..5b01e57 100644
--- a/include/xo/object2/number/GCObjectConversion_DInteger.hpp
+++ b/include/xo/object2/number/GCObjectConversion_DInteger.hpp
@@ -7,7 +7,7 @@
 
 #include "DInteger.hpp"
 #include "number/IGCObject_DInteger.hpp"
-#include <xo/gc/GCObjectConversion.hpp>
+#include <xo/alloc2/GCObjectConversion.hpp>
 
 namespace xo {
     namespace scm {
diff --git a/include/xo/object2/number/IGCObject_DFloat.hpp b/include/xo/object2/number/IGCObject_DFloat.hpp
index b8e15b7..ee2eecf 100644
--- a/include/xo/object2/number/IGCObject_DFloat.hpp
+++ b/include/xo/object2/number/IGCObject_DFloat.hpp
@@ -65,4 +65,4 @@ namespace xo {
     } /*namespace scm*/
 } /*namespace xo*/
 
-/* end */
+/* end */
\ No newline at end of file
diff --git a/include/xo/object2/number/IGCObject_DInteger.hpp b/include/xo/object2/number/IGCObject_DInteger.hpp
index fd2ea64..799372a 100644
--- a/include/xo/object2/number/IGCObject_DInteger.hpp
+++ b/include/xo/object2/number/IGCObject_DInteger.hpp
@@ -64,4 +64,4 @@ namespace xo {
     } /*namespace scm*/
 } /*namespace xo*/
 
-/* end */
+/* end */
\ No newline at end of file
diff --git a/src/object2/CMakeLists.txt b/src/object2/CMakeLists.txt
index f0aaefb..b2370cf 100644
--- a/src/object2/CMakeLists.txt
+++ b/src/object2/CMakeLists.txt
@@ -45,8 +45,8 @@ set(SELF_SRCS
 xo_add_shared_library4(${SELF_LIB} ${PROJECT_NAME}Targets ${PROJECT_VERSION} 1 ${SELF_SRCS})
 # note: deps here must also appear in cmake/xo_object2Config.cmake.in
 xo_dependency(${SELF_LIB} reflect)
-xo_dependency(${SELF_LIB} xo_gc)
 xo_dependency(${SELF_LIB} xo_stringtable2)
+xo_dependency(${SELF_LIB} xo_alloc2)
 xo_dependency(${SELF_LIB} xo_printable2)
 xo_dependency(${SELF_LIB} subsys)
 xo_dependency(${SELF_LIB} indentlog)
diff --git a/src/object2/ISequence_Any.cpp b/src/object2/ISequence_Any.cpp
index 77da7d3..5e0583f 100644
--- a/src/object2/ISequence_Any.cpp
+++ b/src/object2/ISequence_Any.cpp
@@ -3,8 +3,8 @@
  **/
 
 #include "sequence/ISequence_Any.hpp"
-#include <exception>
 #include <iostream>
+#include <exception>
 
 namespace xo {
 namespace scm {
diff --git a/utest/CMakeLists.txt b/utest/CMakeLists.txt
index 7843e0e..e4532c2 100644
--- a/utest/CMakeLists.txt
+++ b/utest/CMakeLists.txt
@@ -12,5 +12,6 @@ set(UTEST_SRCS
 
 xo_add_utest_executable(${UTEST_EXE} ${UTEST_SRCS})
 xo_self_dependency(${UTEST_EXE} xo_object2)
+xo_dependency(${UTEST_EXE} xo_gc)
 #xo_dependency(${UTEST_EXE} randomgen)
 xo_external_target_dependency(${UTEST_EXE} Catch2 Catch2::Catch2)
diff --git a/utest/Printable.test.cpp b/utest/Printable.test.cpp
index 15de595..edf230a 100644
--- a/utest/Printable.test.cpp
+++ b/utest/Printable.test.cpp
@@ -20,7 +20,8 @@
 #include <xo/object2/number/IGCObject_DInteger.hpp>
 
 #include <xo/alloc2/Collector.hpp>
-#include <xo/gc/DX1Collector.hpp>
+
+#include <xo/gc/X1Collector.hpp>
 #include <xo/gc/detail/IAllocator_DX1Collector.hpp>
 #include <xo/gc/detail/ICollector_DX1Collector.hpp>