From b76c386d34994316f801578a6de108f21df0ee20 Mon Sep 17 00:00:00 2001
From: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>
Date: Wed, 25 Oct 2023 15:01:45 -0400
Subject: [PATCH] COMP: Fix configuration without explicitly setting
 CTK_QT_VERSION

Address a regression introduced in a0e74a080 (COMP: Update CMake files
removing support for Qt 4.x) by fixing the following error reported when
configuring without explicitly setting CTK_QT_VERSION:

```
cmake \
  -DQt5_DIR:PATH=$Qt5_DIR \
  -DCMAKE_BUILD_TYPE:STRING=Release \
  ../CTK

[...]
-- Checking if --no-as-needed linker flag is required - no
-- CTK_LIB_Core_WITH_BFD_SHARED is OFF
-- CTK_LIB_Core_WITH_BFD_STATIC is OFF
CMake Error at Libs/Visualization/VTK/Widgets/target_libraries.cmake:15 (message):
  Support for this Qt is not implemented
Call Stack (most recent call first):
  CMake/ctkMacroTargetLibraries.cmake:131 (include)
  CMake/ctkFunctionGenerateDGraphInput.cmake:78 (ctkFunctionCollectTargetLibraryNames)
  CMakeLists.txt:844 (ctkFunctionGenerateDGraphInput)
[...]
```
---
 CMake/ctkMacroSetupQt.cmake | 10 ----------
 CMakeLists.txt              |  8 ++++++++
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/CMake/ctkMacroSetupQt.cmake b/CMake/ctkMacroSetupQt.cmake
index 38e4c2f894..cfd93cf345 100644
--- a/CMake/ctkMacroSetupQt.cmake
+++ b/CMake/ctkMacroSetupQt.cmake
@@ -20,14 +20,6 @@
 
 #! \ingroup CMakeUtilities
 macro(ctkMacroSetupQt)
-  set(CTK_QT_VERSION "5" CACHE STRING "Expected Qt version")
-  mark_as_advanced(CTK_QT_VERSION)
-
-  set_property(CACHE CTK_QT_VERSION PROPERTY STRINGS 5)
-
-  if(NOT CTK_QT_VERSION VERSION_EQUAL "5")
-    message(FATAL_ERROR "Expected value for CTK_QT_VERSION is '5'")
-  endif()
 
   if(CTK_QT_VERSION VERSION_EQUAL "5")
     cmake_minimum_required(VERSION 2.8.12)
@@ -139,6 +131,4 @@ macro(ctkMacroSetupQt)
   else()
     message(FATAL_ERROR "Support for Qt${CTK_QT_VERSION} is not implemented")
   endif()
-
-  mark_as_superbuild(CTK_QT_VERSION)
 endmacro()
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6ba2e9c52b..8256a4e873 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -102,6 +102,14 @@ mark_as_superbuild(
 option(CTK_SUPERBUILD "Build ${PROJECT_NAME} and the projects it depends on." ON)
 mark_as_advanced(CTK_SUPERBUILD)
 
+#-----------------------------------------------------------------------------
+# Qt version
+#
+set(CTK_QT_VERSION "5" CACHE STRING "Expected Qt version")
+mark_as_advanced(CTK_QT_VERSION)
+set_property(CACHE CTK_QT_VERSION PROPERTY STRINGS 5)
+mark_as_superbuild(CTK_QT_VERSION)
+
 #-----------------------------------------------------------------------------
 # Output directories.
 #