The build directory was:
C:\Perl\cpan\build\Inline-CPP-0.25-jUO8zP\_Inline\build\_01basic_t_5cd2

To debug the problem, cd to the build directory, and inspect the output files.

 at t/01basic.t line 30
BEGIN failed--compilation aborted at t/01basic.t line 64.
t/01basic.....dubious
        Test returned status 2 (wstat 512, 0x200)
DIED. FAILED tests 1-10
        Failed 10/10 tests, 0.00% okay
t/02prefix....
Microsoft (R) Program Maintenance Utility   Version 1.50
Copyright (c) Microsoft Corp 1988-94. All rights reserved.

        C:\Perl\bin\perl.exe C:\Perl\lib\ExtUtils\xsubpp  -typemap C:\Perl\lib\E
xtUtils\typemap -typemap C:\Perl\cpan\build\Inline-CPP-0.25-jUO8zP\_Inline\build
\_02prefix_t_4ede\CPP.map  _02prefix_t_4ede.xs > _02prefix_t_4ede.xsc && C:\Perl
\bin\perl.exe -MExtUtils::Command -e mv _02prefix_t_4ede.xsc _02prefix_t_4ede.c
        gcc -c  -IC:/Perl/cpan/build/Inline-CPP-0.25-jUO8zP/t  -DNDEBUG -DWIN32
-D_CONSOLE -DNO_STRICT -DHAVE_DES_FCRYPT -DNO_HASH_SEED -DUSE_SITECUSTOMIZE -DPR
IVLIB_LAST_IN_INC -DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_SYS -DUSE_PERLIO -DPER
L_MSVCRT_READFIX -DHASATTRIBUTE -fno-strict-aliasing -O2    -DVERSION=\"0.00\"
-DXS_VERSION=\"0.00\"  "-IC:\Perl\lib\CORE"   _02prefix_t_4ede.c
_02prefix_t_4ede.xs:2:22: iostream.h: No such file or directory
_02prefix_t_4ede.xs:4: error: syntax error before string constant
In file included from C:/Perl/lib/CORE/win32thread.h:4,
                 from C:/Perl/lib/CORE/perl.h:2611,
                 from _02prefix_t_4ede.xs:6:
C:/Perl/lib/CORE/win32.h:289: error: syntax error before "need"
_02prefix_t_4ede.xs:9: error: syntax error before '}' token
_02prefix_t_4ede.xs:17: error: field `dummy' declared as a function
_02prefix_t_4ede.xs:17: warning: no semicolon at end of struct or union
_02prefix_t_4ede.xs:17: error: syntax error before '{' token
_02prefix_t_4ede.c: In function `XS_main__Foo_dummy':
_02prefix_t_4ede.c:50: error: `Foo' undeclared (first use in this function)
_02prefix_t_4ede.c:50: error: (Each undeclared identifier is reported only once
_02prefix_t_4ede.c:50: error: for each function it appears in.)
_02prefix_t_4ede.c:50: error: `THIS' undeclared (first use in this function)
_02prefix_t_4ede.c:55: error: syntax error before ')' token
_02prefix_t_4ede.c: In function `XS_main__Foo_new':
_02prefix_t_4ede.c:82: error: `Foo' undeclared (first use in this function)
_02prefix_t_4ede.c:82: error: `RETVAL' undeclared (first use in this function)
_02prefix_t_4ede.c:84: error: `new' undeclared (first use in this function)
_02prefix_t_4ede.c:84: error: syntax error before "Foo"
_02prefix_t_4ede.c: In function `XS_main__Foo_DESTROY':
_02prefix_t_4ede.c:105: error: `Foo' undeclared (first use in this function)
_02prefix_t_4ede.c:105: error: `THIS' undeclared (first use in this function)
_02prefix_t_4ede.c:108: error: syntax error before ')' token
_02prefix_t_4ede.c:115: error: `delete' undeclared (first use in this function)
_02prefix_t_4ede.c:115: error: syntax error before "THIS"
NMAKE : fatal error U1077: 'C:\WINDOWS\system32\cmd.exe' : return code '0x1'
Stop.

A problem was encountered while attempting to compile and install your Inline
CPP code. The command that failed was:
  nmake > out.make 2>&1

The build directory was:
C:\Perl\cpan\build\Inline-CPP-0.25-jUO8zP\_Inline\build\_02prefix_t_4ede

To debug the problem, cd to the build directory, and inspect the output files.

 at t/02prefix.t line 0
INIT failed--call queue aborted.
t/02prefix....dubious
        Test returned status 2 (wstat 512, 0x200)
DIED. FAILED tests 1-4
        Failed 4/4 tests, 0.00% okay
Failed Test  Stat Wstat Total Fail  List of Failed
-------------------------------------------------------------------------------
t/01basic.t     2   512    10   20  1-10
t/02prefix.t    2   512     4    8  1-4
Failed 2/2 test scripts. 14/14 subtests failed.
Files=2, Tests=14, 149 wallclock secs ( 0.00 cusr +  0.00 csys =  0.00 CPU)
Failed 2/2 test programs. 14/14 subtests failed.
NMAKE : fatal error U1077: 'C:\WINDOWS\system32\cmd.exe' : return code '0x2'
Stop.
  NEILW/Inline-CPP-0.25.tar.gz
  C:\Perl\site\bin\nmake.EXE test -- NOT OK
Warning (usually harmless): 'YAML' not installed, will not store persistent stat
e
Running make install
  make test had returned bad status, won't install without force
Failed during this command:
 NEILW/Inline-CPP-0.25.tar.gz                 : make_test NO