BUG: Fixes Linux + Qt 6.9 cmake configuration and linker errors (#752)

Signed-off-by: Michael Jackson <[email protected]>

Author: imikejackson

src/CMakeLists.txt

@@ -7,10 +7,16 @@ if (${QT_VERSION_MAJOR})
 else()
   find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
 endif()
-find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Gui Widgets REQUIRED)
-if (UNIX AND NOT APPLE)
+
+set(ads_DEP_LIBS Core Gui Widgets)
+if (UNIX AND NOT APPLE AND QT_VERSION_MAJOR STREQUAL "6" AND QT_VERSION_MINOR GREATER 8)
+    set(ads_DEP_LIBS Core Gui GuiPrivate Widgets)
+endif()
+find_package(Qt${QT_VERSION_MAJOR} COMPONENTS ${ads_DEP_LIBS} REQUIRED)
+if (UNIX AND NOT APPLE AND QT_VERSION_MAJOR STREQUAL "6" AND QT_VERSION_MINOR GREATER 8)
     include_directories(${Qt${QT_VERSION_MAJOR}Gui_PRIVATE_INCLUDE_DIRS})
 endif()
+
 set(CMAKE_INCLUDE_CURRENT_DIR ON)
 if(BUILD_STATIC)
     set(CMAKE_STATIC_LIBRARY_SUFFIX "_static${CMAKE_STATIC_LIBRARY_SUFFIX}")