Checking if your kit is complete... Looks good Writing Makefile for Socket6 Microsoft (R) Program Maintenance Utility Version 6.00.8168.0 Copyright (C) Microsoft Corp 1988-1998. All rights reserved. cp Socket6.pm blib\lib/Socket6.pm C:\cpanrun\build\5-10-0\bin\perl.exe C:\cpanrun\build\5-10-0\lib\ExtUtils\xsubpp -noprototypes -typemap C:\cpanrun\build\5-10-0\lib\ExtUtils\typemap Socket6.xs > Socket6.xsc && C:\cpanrun\build\5-10-0\bin\perl.exe -MExtUtils::Command -e mv Socket6.xsc Socket6.c cl -c -nologo -GF -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DUSE_SITECUSTOMIZE -DPRIVLIB_LAST_IN_INC -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_READFIX -MD -Zi -DNDEBUG -O1 -DVERSION=\"0.20\" -DXS_VERSION=\"0.20\" "-IC:\cpanrun\build\5-10-0\lib\CORE" Socket6.c Socket6.c Socket6.xs(44) : fatal error C1189: #error : Microsoft Platform SDK (Aug. 2001) or later required. NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop.