https://issues.dlang.org/show_bug.cgi?id=14849
--- Comment #13 from Rainer Schuetze <r.sagita...@gmx.de> --- >UCRTVersion=10.0.10150.0 >UMVersion=10.0.10075.0 >[...] >LIB=%LIB%;"%UniversalCRTSdkDir%\Lib\%UMVersion%\um\x86" >LIB=%LIB%;"%UniversalCRTSdkDir%\Lib\%UCRTVersion%\ucrt\x86" I don't see UMVersion being set by vcvarsall.bat. The installer just mimicks what is done by this batch. Is UMVersion set by installing the Windows 10 SDK? (I have only 8.1 installed). --