diff --git a/2014/go4java/battle.go b/2014/go4java/battle.go
index 0036f16..8fc9505 100644
--- a/2014/go4java/battle.go
+++ b/2014/go4java/battle.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/chan.go b/2014/go4java/chan.go
index 791a8ad..c9ea793 100644
--- a/2014/go4java/chan.go
+++ b/2014/go4java/chan.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/conc1.go b/2014/go4java/conc1.go
index 947ef7e..9d114bc 100644
--- a/2014/go4java/conc1.go
+++ b/2014/go4java/conc1.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/conc2.go b/2014/go4java/conc2.go
index 407bcfc..9fc8aa3 100644
--- a/2014/go4java/conc2.go
+++ b/2014/go4java/conc2.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/conc3.go b/2014/go4java/conc3.go
index bd2c423..ada59d1 100644
--- a/2014/go4java/conc3.go
+++ b/2014/go4java/conc3.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/embedsample.go b/2014/go4java/embedsample.go
index d475b18..d14a75c 100644
--- a/2014/go4java/embedsample.go
+++ b/2014/go4java/embedsample.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import "fmt"
diff --git a/2014/go4java/goodcounter.go b/2014/go4java/goodcounter.go
index 8cfca48..510bfaf 100644
--- a/2014/go4java/goodcounter.go
+++ b/2014/go4java/goodcounter.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/goroutines.go b/2014/go4java/goroutines.go
index 57bc8fd..d137b3a 100644
--- a/2014/go4java/goroutines.go
+++ b/2014/go4java/goroutines.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/loopback.go b/2014/go4java/loopback.go
index 4574bc7..63e8b93 100644
--- a/2014/go4java/loopback.go
+++ b/2014/go4java/loopback.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/go4java/writecounter.go b/2014/go4java/writecounter.go
index fd5a247..379ca0b 100644
--- a/2014/go4java/writecounter.go
+++ b/2014/go4java/writecounter.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/deadlock.go b/2014/playground/deadlock.go
index 2cafec8..2ff641a 100644
--- a/2014/playground/deadlock.go
+++ b/2014/playground/deadlock.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 func main() {
diff --git a/2014/playground/file.go b/2014/playground/file.go
index a73beb0..cf0cd32 100644
--- a/2014/playground/file.go
+++ b/2014/playground/file.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/heap.go b/2014/playground/heap.go
index dc0f777..83cd104 100644
--- a/2014/playground/heap.go
+++ b/2014/playground/heap.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 type list struct {
diff --git a/2014/playground/hello.go b/2014/playground/hello.go
index 4ffebac..b24f378 100644
--- a/2014/playground/hello.go
+++ b/2014/playground/hello.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import "fmt"
diff --git a/2014/playground/http.go b/2014/playground/http.go
index 863b00b..18c6e39 100644
--- a/2014/playground/http.go
+++ b/2014/playground/http.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/loop.go b/2014/playground/loop.go
index 06c48fd..7b40099 100644
--- a/2014/playground/loop.go
+++ b/2014/playground/loop.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 func main() {
diff --git a/2014/playground/net.go b/2014/playground/net.go
index 2728055..eb8b759 100644
--- a/2014/playground/net.go
+++ b/2014/playground/net.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/removeall.go b/2014/playground/removeall.go
index d69032d..5121ca7 100644
--- a/2014/playground/removeall.go
+++ b/2014/playground/removeall.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/rm.go b/2014/playground/rm.go
index ee5f946..27c53d5 100644
--- a/2014/playground/rm.go
+++ b/2014/playground/rm.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/sleep.go b/2014/playground/sleep.go
index da2cad8..a38d597 100644
--- a/2014/playground/sleep.go
+++ b/2014/playground/sleep.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/sleepfast.go b/2014/playground/sleepfast.go
index b53ddb1..f3cd8dd 100644
--- a/2014/playground/sleepfast.go
+++ b/2014/playground/sleepfast.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/playground/stack.go b/2014/playground/stack.go
index 4279a21..d2a0a0e 100644
--- a/2014/playground/stack.go
+++ b/2014/playground/stack.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 func foo(a [1000]byte) {