Hm. Trouble is, to run Build.pl on my setup, I just type "build".

Which means that when I get to step 2 in that scenario, I'm simple redoing step 1.

Never mind, press on:

C:\Perl64\packages\PerlIO-Layers-0.010>build.bat
Building PerlIO-Layers

C:\Perl64\packages\PerlIO-Layers-0.010>build.bat test
t/00-compile.t ............ Can't stat lib: No such file or directory
 at t/00-compile.t line 24
t/00-compile.t ............ skipped: no tests to run
t/10-basics.t ............. Can't locate PerlIO/Layers.pm in @INC (@IN
+C contains: C:\Perl64\packages\PerlIO-Layers-0.010\blib\lib C:\Perl64
+\packages\PerlIO-Layers-0.010\blib\arch c:/Perl64/site/lib c:/Perl64/
+lib .) at t/10-basics.t line 9.
BEGIN failed--compilation aborted at t/10-basics.t line 9.
t/10-basics.t ............. Dubious, test returned 2 (wstat 512, 0x200
+)
No subtests run
t/release-kwalitee.t ...... skipped: these tests are for release candi
+date testing
t/release-pod-coverage.t .. skipped: these tests are for release candi
+date testing
t/release-pod-syntax.t .... skipped: these tests are for release candi
+date testing

Test Summary Report
-------------------
t/10-basics.t           (Wstat: 512 Tests: 0 Failed: 0)
  Non-zero exit status: 2
  Parse errors: No plan found in TAP output
Files=5, Tests=0,  4 wallclock secs ( 0.02 usr +  0.00 sys =  0.02 CPU
+)
Result: FAIL
Failed 1/5 test programs. 0/0 subtests failed.

C:\Perl64\packages\PerlIO-Layers-0.010>dir t\00-compile.t
 Volume in drive C has no label.
 Volume Serial Number is 8C78-4B42

 Directory of C:\Perl64\packages\PerlIO-Layers-0.010\t

05/04/2012  14:20             1,621 00-compile.t
               1 File(s)          1,621 bytes
               0 Dir(s)  144,573,480,960 bytes free
[download]

Hm. No output of any kind from the "compile"; and error messages that make no sense from the nmake build test. Real useful!