Checking if your kit is complete...
Looks good
Writing Makefile for Win32API::MIDI
cp MIDI.pm blib/lib/Win32API/MIDI.pm
cp MIDI/SysEX/Roland.pm blib/lib/Win32API/MIDI/SysEX/Roland.pm
cp MIDI/Out.pm blib/lib/Win32API/MIDI/Out.pm
cp MIDI/SysEX.pm blib/lib/Win32API/MIDI/SysEX.pm
cp MIDI/SysEX/Yamaha.pm blib/lib/Win32API/MIDI/SysEX/Yamaha.pm
cp MIDI/SysEX/MIDIbox.pm blib/lib/Win32API/MIDI/SysEX/MIDIbox.pm
/home/cpanrun/pa-risc1.1/build/5.6.1/bin/perl -I/home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/PA-RISC1.1-thread-multi -I/home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1 /home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/ExtUtils/xsubpp  -typemap /home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/ExtUtils/typemap -typemap typemap MIDI.xs > MIDI.xsc && mv MIDI.xsc MIDI.c
cc -c  -D_POSIX_C_SOURCE=199506L -D_HPUX_SOURCE +DA1.1 +DS2.0a +z -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Ae -O +Onolimit   -DVERSION=\"0.05\" -DXS_VERSION=\"0.05\" +z -I/home/cpanrun/pa-risc1.1/build/5.6.1/lib/5.6.1/PA-RISC1.1-thread-multi/CORE  MIDI.c
cpp: "MIDI.xs", line 31: error 4036: Can't open include file 'windows.h'.
cpp: "MIDI.xs", line 32: error 4036: Can't open include file 'mmsystem.h'.
make: *** [MIDI.o] Error 1