Checking if your kit is complete...
Looks good
Writing Makefile for IOLayer::Base64
cp lib/IOLayer/Base64.pm blib/lib/IOLayer/Base64.pm
Manifying blib/man3/IOLayer::Base64.3
PERL_DL_NONLAZY=1 /Users/cpanrun/pristine/5.8.7/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/01basic...."my" variable $out masks earlier declaration in same scope at t/01basic.t line 67.
"my" variable $in masks earlier declaration in same scope at t/01basic.t line 86.
Unknown PerlIO layer "Via" at t/01basic.t line 33.

#     Failed test (t/01basic.t at line 33)
print() on closed filehandle $out at t/01basic.t line 38.

#     Failed test (t/01basic.t at line 38)

#     Failed test (t/01basic.t at line 39)

#     Failed test (t/01basic.t at line 45)
readline() on closed filehandle $test at t/01basic.t line 46.

#     Failed test (t/01basic.t at line 46)
#          got: undef
#     expected: 'VGhpcyBpcyBhIHTpc3QgZm9yIE1JTUUtZW5jb2RlZCAoYmFzZTY0KSB0ZXh0IHRoYXQgaGFzIGjg
# cmRseSBhbnkgc3Bl52lhbCBjaGFyYWN0ZXJzIGluIGl0IGJ1dCB3aGljaCBpcyBub25ldGhlbGVz
# cyBhbiBpbmRpY2F0aW9uIG9mIHRoZSByZWFsIHdvcmxkLgoKV2l0aCBsb25nIGxpbmVzIGFuZCBw
# YXJhZ3JhcGhzIGFuZCBhbGwgdGhhdCBzb3J0IG9mIHRoaW5ncy4KCkFuZCBzbyBvbiBhbmQgc28g
# b24uCi0tIApBbmQgYSBzaWduYXR1cmUK
# '

#     Failed test (t/01basic.t at line 47)
Unknown PerlIO layer "Via" at t/01basic.t line 53.

#     Failed test (t/01basic.t at line 53)
readline() on closed filehandle $in at t/01basic.t line 56.

#     Failed test (t/01basic.t at line 56)
#          got: ''
#     expected: 'This is a tést for MIME-encoded (base64) text that has hàrdly any speçial characters in it but which is nonetheless an indication of the real world.
# 
# With long lines and paragraphs and all that sort of things.
# 
# And so on and so on.
# -- 
# And a signature
# '

#     Failed test (t/01basic.t at line 57)
Unknown PerlIO layer "Via" at t/01basic.t line 66.

#     Failed test (t/01basic.t at line 66)
print() on closed filehandle $out at t/01basic.t line 71.

#     Failed test (t/01basic.t at line 71)

#     Failed test (t/01basic.t at line 72)

#     Failed test (t/01basic.t at line 78)
readline() on closed filehandle $test at t/01basic.t line 79.

#     Failed test (t/01basic.t at line 79)
#          got: undef
#     expected: 'VGhpcyBpcyBhIHTpc3QgZm9yIE1JTUUtZW5jb2RlZCAoYmFzZTY0KSB0ZXh0IHRoYXQgaGFzIGjgcmRseSBhbnkgc3Bl52lhbCBjaGFyYWN0ZXJzIGluIGl0IGJ1dCB3aGljaCBpcyBub25ldGhlbGVzcyBhbiBpbmRpY2F0aW9uIG9mIHRoZSByZWFsIHdvcmxkLgoKV2l0aCBsb25nIGxpbmVzIGFuZCBwYXJhZ3JhcGhzIGFuZCBhbGwgdGhhdCBzb3J0IG9mIHRoaW5ncy4KCkFuZCBzbyBvbiBhbmQgc28gb24uCi0tIApBbmQgYSBzaWduYXR1cmUK'

#     Failed test (t/01basic.t at line 80)
Unknown PerlIO layer "Via" at t/01basic.t line 86.

#     Failed test (t/01basic.t at line 86)
readline() on closed filehandle $in at t/01basic.t line 89.

#     Failed test (t/01basic.t at line 89)
#          got: ''
#     expected: 'This is a tést for MIME-encoded (base64) text that has hàrdly any speçial characters in it but which is nonetheless an indication of the real world.
# 
# With long lines and paragraphs and all that sort of things.
# 
# And so on and so on.
# -- 
# And a signature
# '

#     Failed test (t/01basic.t at line 90)

#     Failed test (t/01basic.t at line 94)
# Looks like you failed 19 tests of 22.
dubious
	Test returned status 19 (wstat 4864, 0x1300)
DIED. FAILED tests 3-11, 13-22
	Failed 19/22 tests, 13.64% okay
Failed Test Stat Wstat Total Fail  Failed  List of Failed
-------------------------------------------------------------------------------
t/01basic.t   19  4864    22   19  86.36%  3-11 13-22
Failed 1/1 test scripts, 0.00% okay. 19/22 subtests failed, 13.64% okay.
make: *** [test_dynamic] Error 19