diff --git a/check.sh b/check.sh
new file mode 100755
index 0000000..f295e8c
--- /dev/null
+++ b/check.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+FILE="$1"
+ 
+if [ -f "$FILE" ]  || [ -d "$FILE" ];
+then
+   echo "[OK  ] $FILE"
+else
+   echo "[FAIL] $FILE" >&2
+fi
diff --git a/make-mac.mk b/make-mac.mk
index 11eeb17..9d0ca34 100644
--- a/make-mac.mk
+++ b/make-mac.mk
@@ -90,6 +90,29 @@ osx_shared_lib: $(OBJS)
 	ln -sf zerotier-sdk-service zerotier-idtool
 	cp docs/osx_zt_sdk.md build/osx_shared_lib/README.md
 
+check:
+	./check.sh build/lwip/liblwip.so
+
+	./check.sh build/osx_shared_lib/libztintercept.so
+	./check.sh build/osx_unity3d_bundle/Debug/ZeroTierSDK_Unity3D_OSX.bundle
+	./check.sh build/osx_app_framework/Debug/ZeroTierSDK_OSX.framework
+
+	./check.sh build/ios_app_framework/Debug-iphoneos/ZeroTierSDK_iOS.framework
+	./check.sh build/ios_unity3d_bundle/Debug-iphoneos/ZeroTierSDK_Unity3D_iOS.bundle
+
+	./check.sh build/
+	./check.sh build/android_jni_lib/
+	./check.sh build/android_jni_lib/
+	./check.sh build/android_jni_lib/
+	./check.sh build/android_jni_lib/
+	./check.sh build/android_jni_lib/
+	./check.sh build/android_jni_lib/
+	./check.sh build/android_jni_lib/
+	./check.sh build/android_jni_lib/
+
+	./check.sh build/
+	./check.sh build/
+	
 clean:
 	rm -rf zerotier-cli zerotier-idtool