Checking if your kit is complete...
Looks good
Note (probably harmless): No library found for '-lavcall'
Note (probably harmless): No library found for '-lcallback'
Writing Makefile for FFI

Microsoft (R) Program Maintenance Utility   Version 6.00.8168.0
Copyright (C) Microsoft Corp 1988-1998. All rights reserved.

cp Library.pm blib\lib/FFI/Library.pm
cp FFI.pm blib\lib/FFI.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 FFI.xs > FFI.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 FFI.xsc FFI.c
Please specify prototyping behavior for FFI.xs (see perlxs manual)
	cl -c  -Iwin32/include -O1 -MD -Zi -DNDEBUG    -DVERSION=\"1.02\"  -DXS_VERSION=\"1.02\"  -ID:\cpanrun\build\5-6-1\lib\CORE -DWIN32 FFI.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 12.00.8168 for 80x86
Copyright (C) Microsoft Corp 1984-1998. All rights reserved.

FFI.c
FFI.xs(5) : fatal error C1083: Cannot open include file: 'avcall.h': No such file or directory
NMAKE : fatal error U1077: 'cl' : return code '0x2'
Stop.