Add instructions to install with qt-base-dev.

src/app/CMakeLists.txt

@@ -37,7 +37,7 @@ qt_add_executable(qtk_gui ${QTK_GUI_SOURCES})
 target_link_libraries(qtk_gui PRIVATE qtk_plugin_library)
 
 if (QTK_GUI_SCENE)
-  target_compile_definitions(qtk_gui PUBLIC QTK_GUI_SCENE)
+  target_compile_definitions(qtk_gui PRIVATE -DQTK_GUI_SCENE)
 endif()
 
 if (WIN32)
@@ -56,21 +56,25 @@ elseif(APPLE)
   )
 endif()
 
-install(
-    TARGETS qtk_gui
-    COMPONENT qtk_gui
-    BUNDLE DESTINATION .
-    LIBRARY DESTINATION lib
-    ARCHIVE DESTINATION lib
-    RUNTIME DESTINATION bin
-)
-
-qt_generate_deploy_app_script(
-    TARGET qtk_gui
-    OUTPUT_SCRIPT QTK_DEPLOY_SCRIPT
-    NO_UNSUPPORTED_PLATFORM_ERROR
-)
-install(SCRIPT ${QTK_DEPLOY_SCRIPT} COMPONENT qtk_gui)
+# qt_generate_deploy_app_script supports Windows and OSX in QtCore >= 6.3.
+# qt_generate_deploy_app_script is supported on Linux in QtCore >= 6.5.0.
+if((Qt6_VERSION VERSION_GREATER_EQUAL "6.3.0" AND (WIN32 OR APPLE))
+    OR Qt6_VERSION VERSION_GREATER_EQUAL "6.5.0")
+  install(
+      TARGETS qtk_gui
+      COMPONENT qtk_gui
+      BUNDLE DESTINATION .
+      LIBRARY DESTINATION lib
+      ARCHIVE DESTINATION lib
+      RUNTIME DESTINATION bin
+  )
+  qt_generate_deploy_app_script(
+      TARGET qtk_gui
+      OUTPUT_SCRIPT QTK_DEPLOY_SCRIPT
+      NO_UNSUPPORTED_PLATFORM_ERROR
+  )
+  install(SCRIPT ${QTK_DEPLOY_SCRIPT} COMPONENT qtk_gui)
+endif()
 
 if(WIN32)
   if(MSVC AND TARGET Qt6::qmake)