diff --git a/nix/overlay.nix b/nix/overlay.nix
index fbc4c65485..c72172df31 100644
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -276,9 +276,4 @@ pkgs: prevPkgs: {
     }
   else
     prevPkgs.gcc;
-
-  # no separate libc package for now
-  libcCrossChooser = name:
-    if name == "retro68" then null else prevPkgs.libcCrossChooser name;
-
 }
diff --git a/nix/platforms.nix b/nix/platforms.nix
index db0ebcf1b6..d3683cadef 100644
--- a/nix/platforms.nix
+++ b/nix/platforms.nix
@@ -2,7 +2,7 @@
   m68k = {
     system = "m68k-macos";
     config = "m68k-apple-macos";
-    libc = "retro68";
+    libc = null;
     parsed = {
       cpu = {
         name = "m68k";
@@ -27,7 +27,7 @@
   powerpc = {
     system = "powerpc-macos";
     config = "powerpc-apple-macos";
-    libc = "retro68";
+    libc = null;
     parsed = {
       cpu = {
         name = "powerpc";
@@ -52,7 +52,7 @@
   carbon = {
     system = "powerpc-carbon";
     config = "powerpc-apple-macos";
-    libc = "retro68";
+    libc = null;
     parsed = {
       cpu = {
         name = "powerpc";