diff --git a/src/tools/msvc/MSBuildProject.pm b/src/tools/msvc/MSBuildProject.pm
index 27397ba..948c548 100644
--- a/src/tools/msvc/MSBuildProject.pm
+++ b/src/tools/msvc/MSBuildProject.pm
@@ -11,6 +11,8 @@ use strict;
 use warnings;
 use base qw(Project);
 
+no warnings qw(redefine); ## no critic
+
 sub _new
 {
 	my $classname = shift;
@@ -399,6 +401,8 @@ use strict;
 use warnings;
 use base qw(MSBuildProject);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -420,6 +424,8 @@ use strict;
 use warnings;
 use base qw(MSBuildProject);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -464,6 +470,8 @@ use strict;
 use warnings;
 use base qw(VC2012Project);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -487,6 +495,8 @@ use strict;
 use warnings;
 use base qw(VC2012Project);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -510,6 +520,8 @@ use strict;
 use warnings;
 use base qw(VC2012Project);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
diff --git a/src/tools/msvc/Project.pm b/src/tools/msvc/Project.pm
index 261c913..0d35546 100644
--- a/src/tools/msvc/Project.pm
+++ b/src/tools/msvc/Project.pm
@@ -229,6 +229,7 @@ sub AddDir
 
 				if ($filter eq "LIBOBJS")
 				{
+					no warnings qw(once);
 					if (grep(/$p/, @main::pgportfiles, @main::pgcommonfiles)
 						== 1)
 					{
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 8f0b355..7cfd5e1 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -10,6 +10,8 @@ use strict;
 use warnings;
 use VSObjectFactory;
 
+no warnings qw(redefine); ## no critic
+
 sub _new
 {
 	my $classname = shift;
@@ -768,6 +770,8 @@ use strict;
 use warnings;
 use base qw(Solution);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -791,6 +795,8 @@ use strict;
 use warnings;
 use base qw(Solution);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -815,6 +821,8 @@ use strict;
 use warnings;
 use base qw(Solution);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -839,6 +847,8 @@ use strict;
 use warnings;
 use base qw(Solution);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -863,6 +873,8 @@ use strict;
 use warnings;
 use base qw(Solution);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -889,6 +901,8 @@ use strict;
 use warnings;
 use base qw(Solution);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -915,6 +929,8 @@ use strict;
 use warnings;
 use base qw(Solution);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
diff --git a/src/tools/msvc/VCBuildProject.pm b/src/tools/msvc/VCBuildProject.pm
index 03b890b..09152b2 100644
--- a/src/tools/msvc/VCBuildProject.pm
+++ b/src/tools/msvc/VCBuildProject.pm
@@ -11,6 +11,8 @@ use strict;
 use warnings;
 use base qw(Project);
 
+no warnings qw(redefine); ## no critic
+
 sub _new
 {
 	my $classname = shift;
@@ -268,6 +270,8 @@ use strict;
 use warnings;
 use base qw(VCBuildProject);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
@@ -289,6 +293,8 @@ use strict;
 use warnings;
 use base qw(VCBuildProject);
 
+no warnings qw(redefine); ## no critic
+
 sub new
 {
 	my $classname = shift;
diff --git a/src/tools/msvc/VSObjectFactory.pm b/src/tools/msvc/VSObjectFactory.pm
index eea59c5..3745f8f 100644
--- a/src/tools/msvc/VSObjectFactory.pm
+++ b/src/tools/msvc/VSObjectFactory.pm
@@ -20,6 +20,8 @@ our (@ISA, @EXPORT);
 @ISA    = qw(Exporter);
 @EXPORT = qw(CreateSolution CreateProject DetermineVisualStudioVersion);
 
+no warnings qw(redefine); ## no critic
+
 sub CreateSolution
 {
 	my $visualStudioVersion = shift;
diff --git a/src/tools/msvc/dummylib/README b/src/tools/msvc/dummylib/README
new file mode 100644
index 0000000..7b63d0e
--- /dev/null
+++ b/src/tools/msvc/dummylib/README
@@ -0,0 +1,13 @@
+
+src/tools/msvc/dummylib
+
+This directory contains just enough of a dummy library to allow checking of
+the programs in src/tools/msvc and src/tools/win32tzlist.pl with
+perl -cw, even on machines that lack the Win32 perl infrastructure.
+
+invoke via:
+
+PERL5LIB=src/tools/msvc/dummylib perl -cw $file
+
+This is the only use that should be made of this directory. Attempting actually
+running of any programs using this library will result in a lot of grief.
diff --git a/src/tools/msvc/dummylib/Win32.pm b/src/tools/msvc/dummylib/Win32.pm
new file mode 100644
index 0000000..079e276
--- /dev/null
+++ b/src/tools/msvc/dummylib/Win32.pm
@@ -0,0 +1,4 @@
+package Win32;
+use strict;
+use warnings;
+1;
diff --git a/src/tools/msvc/dummylib/Win32/Registry.pm b/src/tools/msvc/dummylib/Win32/Registry.pm
new file mode 100644
index 0000000..12fe044
--- /dev/null
+++ b/src/tools/msvc/dummylib/Win32/Registry.pm
@@ -0,0 +1,13 @@
+package Win32::Registry;
+
+use strict;
+use warnings;
+
+use vars qw($HKEY_LOCAL_MACHINE);
+
+use Exporter ();
+our (@EXPORT,@ISA);
+@ISA    = qw(Exporter);
+@EXPORT = qw($HKEY_LOCAL_MACHINE);
+
+1;
diff --git a/src/tools/msvc/dummylib/Win32API/File.pm b/src/tools/msvc/dummylib/Win32API/File.pm
new file mode 100644
index 0000000..34d2bd8
--- /dev/null
+++ b/src/tools/msvc/dummylib/Win32API/File.pm
@@ -0,0 +1,14 @@
+package Win32API::File;
+
+use strict;
+use warnings;
+
+use constant { SEM_FAILCRITICALERRORS => 1,  SEM_NOGPFAULTERRORBOX => 2 };
+sub SetErrormode {};
+use Exporter;
+our(@ISA,@EXPORT_OK,%EXPORT_TAGS);
+@ISA = qw(Exporter);
+@EXPORT_OK = qw(SetErrorMode SEM_FAILCRITICALERRORS SEM_NOGPFAULTERRORBOX);
+%EXPORT_TAGS = (SEM_ => [qw(SEM_FAILCRITICALERRORS SEM_NOGPFAULTERRORBOX)]);
+
+1;