diff --git a/.gitmodules b/.gitmodules
index 085a39a5..60a1dc27 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -2,9 +2,6 @@
 [submodule "external/glew/glew"]
 	path = external/glew/glew
 	url = https://github.com/HeeroYui/glew.git
-[submodule "build"]
-	path = build
-	url = https://github.com/HeeroYui/Build.git
 [submodule "external/etk"]
 	path = external/etk
 	url = https://github.com/HeeroYui/etk.git
@@ -83,3 +80,6 @@
 [submodule "external/river"]
 	path = external/river
 	url = https://github.com/HeeroYui/river.git
+[submodule "external/audio-algo-aec"]
+	path = external/audio-algo-aec
+	url = https://github.com/HeeroYui/audio-algo-aec.git
diff --git a/.travis.yml b/.travis.yml
index 7d1dbc82..72593e57 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,7 @@ branches:
 
 # previous actions:
 before_script: 
+  - git clone git://github.com/HeeroYui/lutin.git
   - git submodule init
   - git submodule update
   - if [ "$CXX" == "clang++" ]; then BUILDER=clang; else BUILDER=gcc; fi
@@ -31,7 +32,7 @@ install:
 
 # build sequence with Lutin :
 script: 
-  - ./build/lutin.py -C -P -c$BUILDER -mdebug -p ewol etk_test exml_test ejson_test enettest
+  - ./lutin/lutin.py -C -P -c$BUILDER -mdebug -p ewol etk_test exml_test ejson_test enettest
   - ./out/Linux_x86_64/debug/staging/$BUILDER/etk_test/usr/bin/etk_test
   - ./out/Linux_x86_64/debug/staging/$BUILDER/ejson_test/usr/bin/ejson_test
   - ./out/Linux_x86_64/debug/staging/$BUILDER/exml_test/usr/bin/exml_test
diff --git a/README.md b/README.md
index 8e3d5339..c26884a7 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,7 @@ Instructions
 
 download the software :
 
+	git clone git://github.com/HeeroYui/lutin.git
 	git clone git://github.com/HeeroYui/ewol.git
 	cd ewol
 	git submodule init
diff --git a/build b/build
deleted file mode 160000
index 35d514e9..00000000
--- a/build
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 35d514e9a928685798584e09ecbda3fc2a519eea
diff --git a/external/audio-algo-aec b/external/audio-algo-aec
new file mode 160000
index 00000000..f5f7c80b
--- /dev/null
+++ b/external/audio-algo-aec
@@ -0,0 +1 @@
+Subproject commit f5f7c80b0c65fc2ba78395bc100d903184090012
diff --git a/external/drain b/external/drain
index fa6cc4fa..98cbaedc 160000
--- a/external/drain
+++ b/external/drain
@@ -1 +1 @@
-Subproject commit fa6cc4fa5ce3ac492fc13481a2859c2544d1d410
+Subproject commit 98cbaedc2c62a73be4b97a69bb4147c2246aa9a9
diff --git a/external/exml b/external/exml
index 13d741b7..e64954b1 160000
--- a/external/exml
+++ b/external/exml
@@ -1 +1 @@
-Subproject commit 13d741b770f0b802cbfdecf132fddc099b087bf7
+Subproject commit e64954b1a1022183831c8f495d0fafa914205284
diff --git a/external/river b/external/river
index 6622cd82..bf05f46f 160000
--- a/external/river
+++ b/external/river
@@ -1 +1 @@
-Subproject commit 6622cd823789eea38b88bae2bcf0ce1c6280df9a
+Subproject commit bf05f46f24e5d9acca927e68a31fb7d3485542b0