C:\Win32-API-0.41>perl makefile.pl Checking if your kit is complete... Looks good Writing Makefile for Win32::API::Callback Writing Makefile for Win32::API C:\Win32-API-0.41>nmake Microsoft (R) Program Maintenance Utility Version 1.50 Copyright (c) Microsoft Corp 1988-94. All rights reserved. cp Type.pm blib\lib\Win32/API/Type.pm cp Callback.pm blib\lib\Win32/API/Callback.pm cp Struct.pm blib\lib\Win32/API/Struct.pm cp API.pm blib\lib\Win32/API.pm C:\Perl\bin\perl.exe C:\Perl\lib\ExtUtils/xsubpp -typemap C:\Perl\lib\E xtUtils\typemap Callback.xs > Callback.xsc && C:\Perl\bin\perl.exe -MExtUtils:: Command -e mv Callback.xsc Callback.c cl -c -nologo -Gf -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CONSOLE -DNO_ST RICT -DHAVE_DES_FCRYPT -DNO_HASH_SEED -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SY S -DUSE_PERLIO -DPERL_MSVCRT_READFIX -MD -Zi -DNDEBUG -O1 -DVERSION=\"0.41\" -DXS_VERSION=\"0.41\" "-IC:\Perl\lib\CORE" Callback.c 'cl' is not recognized as an internal or external command, operable program or batch file. NMAKE : fatal error U1077: 'C:\WINDOWS\system32\cmd.exe' : return code '0x1' Stop. NMAKE : fatal error U1077: 'C:\WINDOWS\system32\cmd.exe' : return code '0x2' Stop.