Checking if your kit is complete... Looks good Writing Makefile for Net::addrinfo cp addrinfo.pm blib\lib\Net\addrinfo.pm D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\cpanrun\build\5-6-1NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop. s -typemap D:\cpanrun\build\5-6-1\lib\ExtUtils\typemap -typemap typemap addrinfo.xs > addrinfo.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 addrinfo.xsc addrinfo.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=\"1.01\" -DXS_VERSION=\"1.01\" -ID:\cpanrun\build\5-6-1\lib\CORE addrinfo.c addrinfo.c addrinfo.xs(20) : fatal error C1083: Cannot open include file: 'unistd.h': No such file or directory