Improve macOS app build process and bundle handling.

- Updated `make-app-release` script to use `macdeployqt` with proper verbosity and bundle fixup.
- Introduced post-build fixup using CMake's `BundleUtilities` to internalize non-Qt dylibs.
- Enhanced macOS bundle RPATH settings for accurate Framework resolution.
- Added optional `kge_fixup_bundle` CMake target for post-build handling.
- Refined `default.nix` to load Nixpkgs in a default argument.

CMakeLists.txt

@@ -379,12 +379,18 @@ if (${BUILD_GUI})
                 ${CMAKE_CURRENT_BINARY_DIR}/kge-Info.plist
                 @ONLY)
 
+        # Ensure proper macOS bundle properties and RPATH so our bundled
+        # frameworks are preferred over system/Homebrew ones.
         set_target_properties(kge PROPERTIES
                 MACOSX_BUNDLE TRUE
                 MACOSX_BUNDLE_GUI_IDENTIFIER ${KGE_BUNDLE_ID}
                 MACOSX_BUNDLE_BUNDLE_NAME "kge"
                 MACOSX_BUNDLE_ICON_FILE ${MACOSX_BUNDLE_ICON_FILE}
-                MACOSX_BUNDLE_INFO_PLIST "${CMAKE_CURRENT_BINARY_DIR}/kge-Info.plist")
+                MACOSX_BUNDLE_INFO_PLIST "${CMAKE_CURRENT_BINARY_DIR}/kge-Info.plist"
+                # Prefer the app's bundled frameworks at runtime
+                INSTALL_RPATH "@executable_path/../Frameworks"
+                BUILD_WITH_INSTALL_RPATH TRUE
+        )
 
         add_dependencies(kge kte)
         add_custom_command(TARGET kge POST_BUILD
@@ -408,4 +414,19 @@ if (${BUILD_GUI})
     # Install kge man page only when GUI is built
     install(FILES docs/kge.1 DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
     install(FILES kge.png DESTINATION ${CMAKE_INSTALL_PREFIX}/share/icons)
+
+    # Optional post-build bundle fixup (can also be run from scripts).
+    # This provides a CMake target to run BundleUtilities' fixup_bundle on the
+    # built app, useful after macdeployqt to ensure non-Qt dylibs are internalized.
+    if (APPLE)
+        include(CMakeParseArguments)
+        add_custom_target(kge_fixup_bundle ALL
+                COMMAND ${CMAKE_COMMAND}
+                    -DAPP_BUNDLE=$<TARGET_BUNDLE_DIR:kge>
+                    -P ${CMAKE_CURRENT_LIST_DIR}/cmake/fix_bundle.cmake
+                BYPRODUCTS $<TARGET_BUNDLE_DIR:kge>/Contents/Frameworks
+                COMMENT "Running fixup_bundle on kge.app to internalize non-Qt dylibs"
+                VERBATIM)
+        add_dependencies(kge_fixup_bundle kge)
+    endif ()
 endif ()

default.nix

@@ -1,5 +1,6 @@
 {
-  lib,
+  pkgs ? import <nixpkgs> {},
+  lib ? pkgs.lib,
   stdenv,
   cmake,
   ncurses,

make-app-release

@@ -16,14 +16,18 @@ open .
 cd ..
 
 mkdir -p cmake-build-release-qt
-cmake -S . -B cmake-build-release -DBUILD_GUI=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_ASAN=OFF
+cmake -S . -B cmake-build-release-qt -DBUILD_GUI=ON -DKTE_USE_QT=ON -DCMAKE_BUILD_TYPE=Release -DENABLE_ASAN=OFF
 
 cd cmake-build-release-qt
 make clean
 rm -fr kge.app* kge-qt.app*
 make
-mv kge.app kge-qt.app
-macdeployqt kge-qt.app -always-overwrite
+mv -f kge.app kge-qt.app
+# Use the same Qt's macdeployqt as used for building; ensure it overwrites in-bundle paths
+macdeployqt kge-qt.app -always-overwrite -verbose=3
+
+# Run CMake BundleUtilities fixup to internalize non-Qt dylibs and rewrite install names
+cmake -DAPP_BUNDLE="$(pwd)/kge-qt.app" -P "${PWD%/*}/cmake/fix_bundle.cmake"
 zip -r kge-qt.app.zip kge-qt.app 
 sha256sum kge-qt.app.zip
 open .