Checking if your kit is complete... Looks good Writing Makefile for IO::Sockatmark Microsoft (R) Program Maintenance Utility Version 6.00.8168.0 Copyright (C) Microsoft Corp 1988-1998. All rights reserved. cp Sockatmark.pm blib\lib\IO\Sockatmark.pm C:\cpanrun\build\5-10-0\bin\perl.exe C:\cpanrun\build\5-10-0\lib\ExtUtils\xsubpp -typemap C:\cpanrun\build\5-10-0\lib\ExtUtils\typemap Sockatmark.xs > Sockatmark.xsc && C:\cpanrun\build\5-10-0\bin\perl.exe -MExtUtils::Command -e mv Sockatmark.xsc Sockatmark.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=\"1.00\" -DXS_VERSION=\"1.00\" "-IC:\cpanrun\build\5-10-0\lib\CORE" Sockatmark.c Sockatmark.c Sockatmark.xs(4) : fatal error C1083: Cannot open include file: 'sys/ioctl.h': No such file or directory NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop.