diff --git a/CHANGELOG.md b/CHANGELOG.md
index 46ae80c..bd4a0ef 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## Added
+- `input` parameter to `mkPlatform` for C. This controls what target
+  gets used for dependent components.
+
+## Removed
+- `targetName` no longer gets sent to the `mk*` functions for C.
+
 ## [4.1.5] - 2024-09-13
 
 ## Fixed
diff --git a/c/default.nix b/c/default.nix
index b763d87..267d925 100644
--- a/c/default.nix
+++ b/c/default.nix
@@ -37,6 +37,7 @@ let
         , pkgs
         , stdenv ? pkgs.stdenv
         , output ? name
+        , input ? output
         , platformOverrides ? _: { }
         , factoryOverrides ? { }
         }@args:
@@ -45,7 +46,7 @@ let
             (import ./make-derivation.nix platformOverrides)
             ({
               inherit base stdenv components;
-              targetName = output;
+              targetName = input;
               mathjax = mathjax';
             } // factoryOverrides);
 
diff --git a/c/make-derivation.nix b/c/make-derivation.nix
index 90cc973..1687483 100644
--- a/c/make-derivation.nix
+++ b/c/make-derivation.nix
@@ -189,5 +189,5 @@ in
 lib.makeOverridable fn (
   builtins.intersectAttrs
     (builtins.functionArgs attrsFn)
-    (pkgs // splicedComponents // { inherit targetName; })
+    (pkgs // splicedComponents // { inherit stdenv; })
 )