Checking if your kit is complete... Looks good 'NO_META' is not a known MakeMaker parameter name. Writing Makefile for Algorithm::GDiffDelta Microsoft (R) Program Maintenance Utility Version 6.00.8168.0 Copyright (C) Microsoft Corp 1988-1998. All rights reserved. cp GDiffDelta.pm blib\lib\Algorithm\GDiffDelta.pm D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\cpanrun\build\5-6-1\lib D:\cpanrun\build\5-6-1\lib\ExtUtils/xsubpp -typemap D:\cpanrun\build\5-6-1\lib\ExtUtils\typemap GDiffDelta.xs > GDiffDelta.xsc && D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\cpanrun\build\5-6-1\lib -MExtUtils::Command -e mv GDiffDelta.xsc GDiffDelta.c cl -c -nologo -O1 -MD -Zi -DNDEBUG -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DPERL_MSVCRT_READFIX -O1 -MD -Zi -DNDEBUG -DVERSION=\"0.01\" -DXS_VERSION=\"0.01\" -ID:\cpanrun\build\5-6-1\lib\CORE GDiffDelta.c GDiffDelta.c D:\cpanrun\build\5-6-1\lib\CORE\perl.h(441) : fatal error C1083: Cannot open include file: 'sys/types.h': No such file or directory NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop.