diff --git a/src/pkg/os/error.go b/src/pkg/os/error.go
index 4738d1a4241..75a079c740e 100644
--- a/src/pkg/os/error.go
+++ b/src/pkg/os/error.go
@@ -80,6 +80,8 @@ var (
 	ENAMETOOLONG Error = Errno(syscall.ENAMETOOLONG)
 	EAFNOSUPPORT Error = Errno(syscall.EAFNOSUPPORT)
 	ETIMEDOUT    Error = Errno(syscall.ETIMEDOUT)
+	ENODATA      Error = Errno(syscall.ENODATA)
+	ENOTCONN     Error = Errno(syscall.ENOTCONN)
 )
 
 // PathError records an error and the operation and file path that caused it.
diff --git a/src/pkg/syscall/mkerrors.sh b/src/pkg/syscall/mkerrors.sh
index a13c0e91bae..d40d1f6b3df 100755
--- a/src/pkg/syscall/mkerrors.sh
+++ b/src/pkg/syscall/mkerrors.sh
@@ -116,7 +116,7 @@ done
 		$2 ~ /^E[A-Z0-9_]+$/ ||
 		$2 ~ /^SIG[^_]/ ||
 		$2 ~ /^IN_/ ||
-		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|IFF|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
+		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|EVFILT|EV|SHUT|PROT|MAP|PACKET|MSG|SCM|IFF|NET_RT|RTM|RTF|RTV|RTA|RTAX|MCL)_/ ||
 		$2 == "SOMAXCONN" ||
 		$2 == "NAME_MAX" ||
 		$2 == "IFNAMSIZ" ||
diff --git a/src/pkg/syscall/zerrors_linux_386.go b/src/pkg/syscall/zerrors_linux_386.go
index 43d27827cb2..a73a9496177 100644
--- a/src/pkg/syscall/zerrors_linux_386.go
+++ b/src/pkg/syscall/zerrors_linux_386.go
@@ -424,6 +424,8 @@ const (
 	MAP_SHARED                       = 0x1
 	MAP_STACK                        = 0x20000
 	MAP_TYPE                         = 0xf
+	MCL_CURRENT                      = 0x1
+	MCL_FUTURE                       = 0x2
 	MSG_CMSG_CLOEXEC                 = 0x40000000
 	MSG_CONFIRM                      = 0x800
 	MSG_CTRUNC                       = 0x8
diff --git a/src/pkg/syscall/zerrors_linux_amd64.go b/src/pkg/syscall/zerrors_linux_amd64.go
index 04f4dad2cd6..eea55a2753b 100644
--- a/src/pkg/syscall/zerrors_linux_amd64.go
+++ b/src/pkg/syscall/zerrors_linux_amd64.go
@@ -424,6 +424,8 @@ const (
 	MAP_SHARED                       = 0x1
 	MAP_STACK                        = 0x20000
 	MAP_TYPE                         = 0xf
+	MCL_CURRENT                      = 0x1
+	MCL_FUTURE                       = 0x2
 	MSG_CMSG_CLOEXEC                 = 0x40000000
 	MSG_CONFIRM                      = 0x800
 	MSG_CTRUNC                       = 0x8