diff --git a/CMakeLists.txt b/CMakeLists.txt
index 273e3fe21..e9808a236 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -149,6 +149,7 @@ if(MSVC) # MS Visual C++ compiler
   # /MP                Enable parallel compilation
   # /permissive-       Enable strict standards compliance
   # /utf-8             Set source file encoding and execution char set to UTF-8
+  # /wd4251            Suppress C4251 (DLL interface) warnings around DLL exports   <-- removed to see how Qt6 handles it
   # /W4                Enable warning level 4
   # /Zc:__cplusplus    Enable C++20 detection in headers
   # /Zi                Generate debugging information (Program Database, PDB)
@@ -168,6 +169,8 @@ if(MSVC) # MS Visual C++ compiler
   # /OPT:ICF           Fold identical code
   set(CMAKE_EXE_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE} /DEBUG /OPT:REF /OPT:ICF")
 
+  add_compile_definitions(_SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING) # check if this is still needed with C++20
+
 elseif(CMAKE_COMPILER_IS_GNUCXX) # Linux/GCC, BSD/GCC, Windows/MinGW
   include(CheckCXXCompilerFlag)
 
@@ -191,21 +194,14 @@ elseif(CMAKE_COMPILER_IS_GNUCXX) # Linux/GCC, BSD/GCC, Windows/MinGW
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++20")
   endif()
 
-  # -Wcast-align                          Catch unsafe pointer casts
-  # -Wmissing-declarations                Catch defined functions without prior declaration
-  # -Wno-error=extra                      Downgrade some -Wextra warnings from errors to warnings
-  # -Wno-error=delete-non-virtual-dtor    <-- see if still needed?
-  # -Wno-error=sign-compare               Downgrade comparing signed vs. unsigned integers from errors to warnings
-  # -Wno-error=missing-declarations       Downgrade -Wmissing-declarations from errors to warnings
-  # -Wno-error=sfinae-incomplete          GCC 16+: Qt MOC + protobuf forward declarations trigger this
   set(ADDITIONAL_DEBUG_FLAGS
-      -Wcast-align
-      -Wmissing-declarations
-      -Wno-error=extra
-      -Wno-error=delete-non-virtual-dtor
-      -Wno-error=sign-compare
-      -Wno-error=missing-declarations
-      -Wno-error=sfinae-incomplete
+      -Wcast-align                          # Catch unsafe pointer casts
+      -Wmissing-declarations                # Catch defined functions without prior declaration
+      -Wno-error=extra                      # Downgrade some -Wextra warnings from errors to warnings
+      -Wno-error=delete-non-virtual-dtor    #     <-- see if still needed?
+      -Wno-error=sign-compare               # Downgrade comparing signed vs. unsigned integers from errors to warnings
+      -Wno-error=missing-declarations       # Downgrade -Wmissing-declarations from errors to warnings
+      -Wno-error=sfinae-incomplete          # GCC 16+: Qt MOC + protobuf forward declarations trigger this
   )
 
   foreach(FLAG ${ADDITIONAL_DEBUG_FLAGS})