Checking if your kit is complete... Looks good Writing Makefile for Win32::MIDI::API cp API.pm blib\lib\Win32\MIDI\API.pm D:\cpanrun\build\5-6-1\bin\perl.exe -Id:\cpanrun\build\5-6-1\lib -Id:\cpanrun\build\5-6-1\liNMAKE : fatal error U1077: 'cl' : return code '0x2' Stop. anrun\build\5-6-1\lib\ExtUtils\typemap -typemap typemap API.xs > API.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 API.xsc API.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=\"0.03\" -DXS_VERSION=\"0.03\" -ID:\cpanrun\build\5-6-1\lib\CORE API.c API.c API.xs(285) : error C2065: 'DWORD_PTR' : undeclared identifier API.xs(285) : error C2146: syntax error : missing ')' before identifier 'midiInProc_wrapper' API.xs(285) : error C2198: 'midiInOpen' : too few actual parameters