Checking if your kit is complete... Looks good Writing Makefile for Win32::API::OutputDebugString cp OutputDebugString.pm blib/lib/Win32/API/OutputDebugString.pm AutoSplitting blib/lib/Win32/API/OutputDebugString.pm (blib/lib/auto/Win32/API/OutputDebugString) /home/cpanrun/ia64/build/5.8.2/bin/perl /home/cpanrun/ia64/build/5.8.2/lib/5.8.2/ExtUtils/xsubpp -typemap /home/cpanrun/ia64/build/5.8.2/lib/5.8.2/ExtUtils/typemap OutputDebugString.xs > OutputDebugString.xsc && mv OutputDebugString.xsc OutputDebugString.c Please specify prototyping behavior for OutputDebugString.xs (see perlxs manual) cc -c -D_POSIX_C_SOURCE=199506L -D_REENTRANT -Ae -D_HPUX_SOURCE -Wl,+vnocompatwarnings -DNO_HASH_SEED -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fast +DSitanium2 +Ofltacc=strict -DVERSION=\"0.03\" -DXS_VERSION=\"0.03\" +Z "-I/home/cpanrun/ia64/build/5.8.2/lib/5.8.2/IA64.ARCHREV_0-thread-multi/CORE" OutputDebugString.c Error 112: "OutputDebugString.xs", line 5 # Include file "windows.h" not found. #include "windows.h" ^^^^^^^^^^^ make: *** [OutputDebugString.o] Error 2