diff --git a/scripts/lipo b/scripts/lipo
index a8c4226..12bd686 100755
--- a/scripts/lipo
+++ b/scripts/lipo
@@ -1,19 +1,22 @@
-#!/bin/sh
+#!/bin/bash
+# Precision shim for lipo to handle read-only frameworks from Nix store.
+# See: https://github.com/NixOS/nixpkgs/issues/405066
 
-echo "LIPO SHIM: $@" >&2
+# If the upstream issue is fixed and the file is already writable,
+# this script will still work gracefully.
 
 for arg in "$@"; do
-  case "$arg" in
-    */*.framework/*)
-      fw_dir="${arg%.framework/*}.framework"
-      echo "LIPO SHIM: chmod $fw_dir" >&2
-      chmod -R u+w "$fw_dir" 2>/dev/null
-      ;;
-    *.lipo)
-      echo "LIPO SHIM: chmod $(dirname "$arg")" >&2
-      chmod u+w "$(dirname "$arg")" 2>/dev/null
-      ;;
-  esac
+    # Check if we are acting on a Flutter binary within a framework
+    if [[ "$arg" == *"Flutter.framework/Flutter" || "$arg" == *"FlutterMacOS.framework/FlutterMacOS" ]]; then
+        # Identify the framework directory
+        FW_DIR=$(echo "$arg" | sed 's|/Flutter$||; s|/FlutterMacOS$||')
+
+        if [ -d "$FW_DIR" ]; then
+            # Make the framework and its contents writable
+            chmod -R +w "$FW_DIR" 2>/dev/null
+        fi
+    fi
 done
 
+# Pass through to the real lipo tool
 exec /usr/bin/lipo "$@"
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