--- a/make/vs/testapp/testapp.vcxproj Sun Jan 28 09:35:44 2024 +0100 +++ b/make/vs/testapp/testapp.vcxproj Sun Jan 28 10:06:54 2024 +0100 @@ -115,6 +115,7 @@ <PreprocessorDefinitions>_DEBUG;_CONSOLE;UI_WINUI;%(PreprocessorDefinitions)</PreprocessorDefinitions> <ConformanceMode>true</ConformanceMode> <AdditionalIncludeDirectories>C:\Users\Olaf\Projekte\toolkit\ui;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories> + <LanguageStandard_C>stdc17</LanguageStandard_C> </ClCompile> <Link> <SubSystem>Windows</SubSystem>