commit 4adb329c48fdc708f3911e9e785304cb7d1ad6ab
Author: Gerald Combs <gerald@wireshark.org>
Date:   Fri Mar 26 12:52:01 2021 -0700

    CMake: Enable AUTO{MOC,UIC,RCC} earlier.
    
    Enable CMAKE_AUTOMOC, CMAKE_AUTOUIC, and CMAKE_AUTORCC before searching
    for Qt packages. This is apparently required for CMake 3.20.0 and later.
    Fixes #17314.
    
    (cherry picked from commit be2b0fc810fb2f2a80e471138dc29f0cbe87b209)
    
     Conflicts:
            ui/qt/CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc96707896..e99d486711 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1094,6 +1094,10 @@ ws_find_package(Systemd BUILD_sdjournal HAVE_SYSTEMD)
 
 # Build the Qt GUI?
 if(BUILD_wireshark)
+	set(CMAKE_AUTOMOC ON)
+	set(CMAKE_AUTOUIC ON)
+	set(CMAKE_AUTORCC ON)
+
 	# Untested, may not work if CMAKE_PREFIX_PATH gets overwritten
 	# somewhere. The if WIN32 in this place is annoying as well.
 	if(WIN32)
diff --git a/ui/qt/CMakeLists.txt b/ui/qt/CMakeLists.txt
index 20f46802a1..85993a1c71 100644
--- a/ui/qt/CMakeLists.txt
+++ b/ui/qt/CMakeLists.txt
@@ -611,10 +611,6 @@ include_directories(
 	${CMAKE_CURRENT_SOURCE_DIR}
 )
 
-set(CMAKE_AUTOMOC TRUE)
-set(CMAKE_AUTOUIC TRUE)
-set(CMAKE_AUTORCC TRUE)
-
 if(NOT Qt5Widgets_VERSION VERSION_LESS "5.9")
 	# Drop the file modification time of source files from generated files
 	# to help with reproducible builds. We do not use QFileInfo.lastModified