diff --git a/ios/Runner.xcodeproj/project.pbxproj b/ios/Runner.xcodeproj/project.pbxproj
index 065d08b..57b889d 100644
--- a/ios/Runner.xcodeproj/project.pbxproj
+++ b/ios/Runner.xcodeproj/project.pbxproj
@@ -336,7 +336,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
+			shellScript = "export PATH=\"$PROJECT_DIR/scripts:$PATH\"\n/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
 		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
@@ -351,7 +351,7 @@
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 			shellPath = /bin/sh;
-			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" build";
+			shellScript = "export PATH=\"$PROJECT_DIR/scripts:$PATH\"\n/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" build";
 		};
 		EE82EC529EB6C0F1FA480659 /* [CP] Check Pods Manifest.lock */ = {
 			isa = PBXShellScriptBuildPhase;
diff --git a/ios/scripts/lipo b/ios/scripts/lipo
new file mode 100755
index 0000000..eea1eea
--- /dev/null
+++ b/ios/scripts/lipo
@@ -0,0 +1,15 @@
+#!/bin/sh
+# Workaround for NixOS/nixpkgs#405066: frameworks copied from the Nix store
+# stay read-only, so lipo can't write its temporary output file when Flutter
+# thins them during the build. Make the framework writable before delegating
+# to the real lipo.
+for arg in "$@"; do
+  case "$arg" in
+    */*.framework/*)
+      fw_dir="${arg%.framework/*}.framework"
+      chmod -R +w "$fw_dir" 2>/dev/null
+      ;;
+  esac
+done
+
+exec /usr/bin/lipo "$@"