patch problems

overlays/synergy-fix/default.nix

@@ -0,0 +1,17 @@
+{ ... }:
+
+final: prev: {
+  synergy = prev.synergy.overrideAttrs (oldAttrs: {
+    postPatch = (oldAttrs.postPatch or "") + ''
+      # Fix deprecated Qt endl usage in QTextStream contexts only
+      # Don't touch cerr/cout which use std::endl
+      find . -name "*.cpp" -type f -exec sed -i \
+        's/\(outStream.*<<.*\)endl/\1Qt::endl/g; s/\(QTextStream.*<<.*\)endl/\1Qt::endl/g' {} +
+      find . -name "*.h" -type f -exec sed -i \
+        's/\(outStream.*<<.*\)endl/\1Qt::endl/g; s/\(QTextStream.*<<.*\)endl/\1Qt::endl/g' {} +
+      
+      # Fix missing SIZE_MAX include
+      sed -i '/#include <cstring>/a#include <cstdint>' src/lib/server/InputFilter.cpp
+    '';
+  });
+}