diff --git a/.forgejo/workflows/ci.yaml b/.forgejo/workflows/ci.yaml
index 88179f10..a0c7e9d4 100644
--- a/.forgejo/workflows/ci.yaml
+++ b/.forgejo/workflows/ci.yaml
@@ -86,3 +86,8 @@ jobs:
         run:
           echo "nix-build ci.nix -A xo-alloc2"
           nix-build ci.nix -A xo-alloc2
+
+      - name: build xo-gc
+        run:
+          echo "nix-build ci.nix -A xo-gc"
+          nix-build ci.nix -A xo-gc
diff --git a/ci.nix b/ci.nix
index 575d84f6..8a3c2192 100644
--- a/ci.nix
+++ b/ci.nix
@@ -14,24 +14,24 @@ in
     inherit (xoPkgs)
       xo-cmake
       xo-indentlog
-      xo-reflectutil
+      xo-subsys
+      xo-flatstring
       xo-randomgen
+      xo-reflectutil
       xo-arena
       xo-facet
+      xo-alloc2
+      xo-gc
       xo-allocutil
       xo-refcnt
-      xo-subsys
       xo-testutil
-      xo-flatstring
       xo-reflect
       xo-ratio
       xo-unit
       xo-callback
       xo-printable2
       xo-alloc
-      xo-alloc2
       xo-stringtable2
-      xo-gc
       xo-object
       xo-type
       xo-object2
diff --git a/pkgs/xo-gc.nix b/pkgs/xo-gc.nix
index 61db7249..89d8d962 100644
--- a/pkgs/xo-gc.nix
+++ b/pkgs/xo-gc.nix
@@ -12,8 +12,6 @@
   xo-facet,
   xo-randomgen,
   xo-subsys,
-#  xo-reflectutil,
-#  xo-indentlog,
   xo-cmake,
 
   buildDocs ? false,
@@ -55,7 +53,5 @@ stdenv.mkDerivation (finalattrs:
       xo-alloc2
       xo-facet
       xo-subsys
-#      xo-reflectutil
-#      xo-indentlog
     ];
   })
diff --git a/shells.nix b/shells.nix
index e04cfe78..b2856597 100644
--- a/shells.nix
+++ b/shells.nix
@@ -317,15 +317,17 @@ in
   xo = {
     cmake          = pkgs.xo-cmake;
     indentlog      = pkgs.xo-indentlog;
-    reflectutil    = pkgs.xo-reflectutil;
+    subsys         = pkgs.xo-subsys;
+    flatstring     = pkgs.xo-flatstring;
     randomgen      = pkgs.xo-randomgen;
+    reflectutil    = pkgs.xo-reflectutil;
     arena          = pkgs.xo-arena;
     facet          = pkgs.xo-facet;
+    alloc2         = pkgs.xo-alloc2;
+    gc             = pkgs.xo-gc;
     allocutil      = pkgs.xo-allocutil;
     refcnt         = pkgs.xo-refcnt;
-    subsys         = pkgs.xo-subsys;
     testutil       = pkgs.xo-testutil;
-    flatstring     = pkgs.xo-flatstring;
     pyutil         = pkgs.xo-pyutil;
     reflect        = pkgs.xo-reflect;
     pyreflect      = pkgs.xo-pyreflect;
@@ -335,9 +337,7 @@ in
     callback       = pkgs.xo-callback;
     printable2     = pkgs.xo-printable2;
     alloc          = pkgs.xo-alloc;
-    alloc2         = pkgs.xo-alloc2;
     stringtable2   = pkgs.xo-stringtable2;
-    gc             = pkgs.xo-gc;
     object         = pkgs.xo-object;
     type           = pkgs.xo-type;
     object2        = pkgs.xo-object2;
diff --git a/xo-cmake/etc/xo/subsystem-list b/xo-cmake/etc/xo/subsystem-list
index d91621bf..0086b814 100644
--- a/xo-cmake/etc/xo/subsystem-list
+++ b/xo-cmake/etc/xo/subsystem-list
@@ -8,6 +8,7 @@ xo-arena
 xo-facet
 xo-testutil
 xo-alloc2
+xo-gc
 xo-alloc
 xo-object
 xo-refcnt
diff --git a/xo.nix b/xo.nix
index a6bcfdf5..8932a4db 100644
--- a/xo.nix
+++ b/xo.nix
@@ -27,10 +27,11 @@ let
   xoPackages = {
     xo-cmake          = callPackage pkgs/xo-cmake.nix          { stdenv = jitStdenv; };
     xo-indentlog      = callPackage pkgs/xo-indentlog.nix      { stdenv = jitStdenv; buildDocs = true; buildExamples = true; };
-    xo-reflectutil    = callPackage pkgs/xo-reflectutil.nix    { stdenv = jitStdenv; };
     xo-randomgen      = callPackage pkgs/xo-randomgen.nix      { stdenv = jitStdenv;                   buildExamples = true; };
+    xo-reflectutil    = callPackage pkgs/xo-reflectutil.nix    { stdenv = jitStdenv; };
     xo-arena          = callPackage pkgs/xo-arena.nix          { stdenv = jitStdenv; buildDocs = true; };
     xo-facet          = callPackage pkgs/xo-facet.nix          { stdenv = jitStdenv; };
+    xo-alloc2         = callPackage pkgs/xo-alloc2.nix         { stdenv = jitStdenv; buildDocs = true; };
     xo-allocutil      = callPackage pkgs/xo-allocutil.nix      { stdenv = jitStdenv; };
     xo-refcnt         = callPackage pkgs/xo-refcnt.nix         { stdenv = jitStdenv; };
     xo-subsys         = callPackage pkgs/xo-subsys.nix         { stdenv = jitStdenv; };
@@ -45,7 +46,6 @@ let
     xo-callback       = callPackage pkgs/xo-callback.nix       { stdenv = jitStdenv; };
     xo-printable2     = callPackage pkgs/xo-printable2.nix     { stdenv = jitStdenv; };
     xo-alloc          = callPackage pkgs/xo-alloc.nix          { stdenv = jitStdenv; buildDocs = true; };
-    xo-alloc2         = callPackage pkgs/xo-alloc2.nix         { stdenv = jitStdenv; buildDocs = true; };
     xo-stringtable2   = callPackage pkgs/xo-stringtable2.nix   { stdenv = jitStdenv; };
     xo-gc             = callPackage pkgs/xo-gc.nix             { stdenv = jitStdenv; buildDocs = true; };
     xo-object         = callPackage pkgs/xo-object.nix         { stdenv = jitStdenv; };