Checking if your kit is complete... Looks good Writing Makefile for JSON::XS Microsoft (R) Program Maintenance Utility Version 7.00.8882 Copyright (C) Microsoft Corp 1988-2000. All rights reserved. cp XS.pm blib\lib\JSON\XS.pm cp XS/Boolean.pm blib\lib\JSON\XS\Boolean.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 -typemap typemap XS.xs > XS.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 XS.xsc XS.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=\"1.5\" -DXS_VERSION=\"1.5\" -ID:\cpanrun\build\5-6-1\lib\CORE XS.c XS.c XS.xs(255) : warning C4047: '=' : 'char *' differs in levels of indirection from 'int ' XS.xs(1015) : error C2065: 'IS_NUMBER_IN_UV' : undeclared identifier XS.xs(1016) : error C2065: 'IS_NUMBER_NEG' : undeclared identifier XS.xs(1397) : error C2065: 'UNI_DISPLAY_QQ' : undeclared identifier NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop.