Checking if your kit is complete...
Looks good
Writing Makefile for Crypt::GCM

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

cp lib/Crypt/GCM.pm blib\lib\Crypt\GCM.pm
	C:\cpanrun\build\5-10-0\bin\perl.exe C:\cpanrun\build\5-10-0\lib\ExtUtils\xsubpp  -typemap C:\cpanrun\build\5-10-0\lib\ExtUtils\typemap -typemap typemap  GCM.xs > GCM.xsc && C:\cpanrun\build\5-10-0\bin\perl.exe -MExtUtils::Command -e mv GCM.xsc GCM.c
Please specify prototyping behavior for GCM.xs (see perlxs manual)
	cl -c  -I.  -nologo -GF -W3 -MD -Zi -DNDEBUG -O1 -DWIN32 -D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DUSE_SITECUSTOMIZE -DPRIVLIB_LAST_IN_INC -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPERL_MSVCRT_READFIX -MD -Zi -DNDEBUG -O1    -DVERSION=\"0.02\"  -DXS_VERSION=\"0.02\"  "-IC:\cpanrun\build\5-10-0\lib\CORE"   GCM.c
GCM.c
GCM.xs(17) : error C2632: 'long' followed by 'long' is illegal
GCM.xs(18) : error C2632: 'long' followed by 'long' is illegal
GCM.xs(141) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(142) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(143) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(144) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(145) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(146) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(147) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(148) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(149) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(150) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(151) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(152) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(153) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(154) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(155) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(156) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(189) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(190) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(191) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(192) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(193) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(194) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(195) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(196) : warning C4244: '=' : conversion from 'unsigned long ' to 'unsigned char ', possible loss of data
GCM.xs(256) : warning C4013: 'strcasecmp' undefined; assuming extern returning int
GCM.xs(364) : warning C4018: '<' : signed/unsigned mismatch
NMAKE : fatal error U1077: 'cl' : return code '0x2'
Stop.