Checking if your kit is complete... Looks good Writing Makefile for Digest::Hashcash cp Hashcash.pm blib\lib\Digest\Hashcash.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 Hashcash.xs > Hashcash.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 Hashcash.xsc Hashcash.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 Hashcash.c Hashcash.c Hashcash.xs(7) : fatal error C1083: Cannot open include file: 'stdint.h': No such file or directory