diff --git a/lang/perl5.12/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5 b/lang/perl5.12/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5
new file mode 100644
index 000000000000..0c3deb2e3271
--- /dev/null
+++ b/lang/perl5.12/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5
@@ -0,0 +1,34 @@
+From 4d106cc5d8fd328d39b1db3c57572dd3dec915b5 Mon Sep 17 00:00:00 2001
+From: Nicholas Clark <nick@ccl4.org>
+Date: Thu, 22 Aug 2013 11:48:29 +0200
+Subject: [PATCH] For SDBM_File, stop EU::MM from generating its default
+ subdirs rule.
+
+The default subdirs rule creates a race condition with the rule that
+Makefile.PL explicitly adds to generate libsdbm.a, which can cause parallel
+makes to fail.
+---
+ ext/SDBM_File/Makefile.PL |  6 ++++++
+ pod/perldelta.pod         | 11 ++++++++++-
+ 2 files changed, 16 insertions(+), 1 deletion(-)
+
+diff --git ext/SDBM_File/Makefile.PL ext/SDBM_File/Makefile.PL
+index fa16a79..b96b80b 100644
+--- ext/SDBM_File/Makefile.PL
++++ ext/SDBM_File/Makefile.PL
+@@ -23,6 +23,12 @@ WriteMakefile(
+ 	      PERL_MALLOC_OK => 1,
+              );
+ 
++# We don't want the default subdir rule, as it creates a race condition with the
++# rule we add below.
++sub MY::subdir_x {
++    return '';
++}
++
+ sub MY::postamble {
+   if ($^O =~ /MSWin32/ && !defined($ENV{SYSTEMROOT})) {
+ 	if ($Config{'make'} =~ /dmake/i) {
+-- 
+1.8.2.1
+
diff --git a/lang/perl5.14/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5 b/lang/perl5.14/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5
new file mode 100644
index 000000000000..0c3deb2e3271
--- /dev/null
+++ b/lang/perl5.14/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5
@@ -0,0 +1,34 @@
+From 4d106cc5d8fd328d39b1db3c57572dd3dec915b5 Mon Sep 17 00:00:00 2001
+From: Nicholas Clark <nick@ccl4.org>
+Date: Thu, 22 Aug 2013 11:48:29 +0200
+Subject: [PATCH] For SDBM_File, stop EU::MM from generating its default
+ subdirs rule.
+
+The default subdirs rule creates a race condition with the rule that
+Makefile.PL explicitly adds to generate libsdbm.a, which can cause parallel
+makes to fail.
+---
+ ext/SDBM_File/Makefile.PL |  6 ++++++
+ pod/perldelta.pod         | 11 ++++++++++-
+ 2 files changed, 16 insertions(+), 1 deletion(-)
+
+diff --git ext/SDBM_File/Makefile.PL ext/SDBM_File/Makefile.PL
+index fa16a79..b96b80b 100644
+--- ext/SDBM_File/Makefile.PL
++++ ext/SDBM_File/Makefile.PL
+@@ -23,6 +23,12 @@ WriteMakefile(
+ 	      PERL_MALLOC_OK => 1,
+              );
+ 
++# We don't want the default subdir rule, as it creates a race condition with the
++# rule we add below.
++sub MY::subdir_x {
++    return '';
++}
++
+ sub MY::postamble {
+   if ($^O =~ /MSWin32/ && !defined($ENV{SYSTEMROOT})) {
+ 	if ($Config{'make'} =~ /dmake/i) {
+-- 
+1.8.2.1
+
diff --git a/lang/perl5.16/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5 b/lang/perl5.16/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5
new file mode 100644
index 000000000000..0c3deb2e3271
--- /dev/null
+++ b/lang/perl5.16/files/patch-4d106cc5d8fd328d39b1db3c57572dd3dec915b5
@@ -0,0 +1,34 @@
+From 4d106cc5d8fd328d39b1db3c57572dd3dec915b5 Mon Sep 17 00:00:00 2001
+From: Nicholas Clark <nick@ccl4.org>
+Date: Thu, 22 Aug 2013 11:48:29 +0200
+Subject: [PATCH] For SDBM_File, stop EU::MM from generating its default
+ subdirs rule.
+
+The default subdirs rule creates a race condition with the rule that
+Makefile.PL explicitly adds to generate libsdbm.a, which can cause parallel
+makes to fail.
+---
+ ext/SDBM_File/Makefile.PL |  6 ++++++
+ pod/perldelta.pod         | 11 ++++++++++-
+ 2 files changed, 16 insertions(+), 1 deletion(-)
+
+diff --git ext/SDBM_File/Makefile.PL ext/SDBM_File/Makefile.PL
+index fa16a79..b96b80b 100644
+--- ext/SDBM_File/Makefile.PL
++++ ext/SDBM_File/Makefile.PL
+@@ -23,6 +23,12 @@ WriteMakefile(
+ 	      PERL_MALLOC_OK => 1,
+              );
+ 
++# We don't want the default subdir rule, as it creates a race condition with the
++# rule we add below.
++sub MY::subdir_x {
++    return '';
++}
++
+ sub MY::postamble {
+   if ($^O =~ /MSWin32/ && !defined($ENV{SYSTEMROOT})) {
+ 	if ($Config{'make'} =~ /dmake/i) {
+-- 
+1.8.2.1
+