diff --git a/jni/Android.mk b/jni/Android.mk
index 438143319..07efba1cd 100755
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -22,16 +22,32 @@ endif
 #endif
 
 
-
+# Speex
+ifeq ($(wildcard $(root-dir)/submodules/externals/prebuilts/speex.mk),)
 include $(root-dir)/submodules/externals/build/speex/Android.mk
+else
+include $(root-dir)/submodules/externals/prebuilts/speex.mk
+endif
 
+# Gsm
+ifeq ($(wildcard $(root-dir)/submodules/externals/prebuilts/gsm.mk),)
 include $(root-dir)/submodules/externals/build/gsm/Android.mk
+else
+include $(root-dir)/submodules/externals/prebuilts/gsm.mk
+endif
 
 include $(root-dir)/submodules/externals/build/exosip/Android.mk
 
 include $(root-dir)/submodules/externals/build/osip/Android.mk
 
+# Openssl
+ifeq ($(wildcard $(root-dir)/submodules/externals/prebuilts/ssl.mk),)
 include $(root-dir)/submodules/externals/openssl/Android.mk
+else
+include $(root-dir)/submodules/externals/prebuilts/ssl.mk
+include $(root-dir)/submodules/externals/prebuilts/crypto.mk
+endif
+
 
 include $(root-dir)/submodules/linphone/oRTP/build/android/Android.mk
 
@@ -45,15 +61,28 @@ include $(root-dir)/submodules/msilbc/Android.mk
 
 ifeq ($(BUILD_X264), 1)
 include $(root-dir)/submodules/msx264/Android.mk
+ifeq ($(wildcard $(root-dir)/submodules/externals/prebuilts/x264.mk),)
 include $(root-dir)/submodules/externals/build/x264/Android.mk
+else
+include $(root-dir)/submodules/externals/prebuilts/x264.mk
+endif
 endif
 
+
+ifeq ($(wildcard $(root-dir)/submodules/externals/prebuilts/ffmpeg.mk),)
 include $(root-dir)/submodules/externals/build/ffmpeg/Android.mk
+else
+include $(root-dir)/submodules/externals/prebuilts/ffmpeg.mk
+endif
 endif #armeabi-v7a
 
 
 ifeq ($(BUILD_GPLV3_ZRTP), 1)
+ifeq ($(wildcard $(root-dir)/submodules/externals/prebuilts/zrtpcpp.mk),)
 include $(root-dir)/submodules/externals/build/libzrtpcpp/Android.mk
+else
+include $(root-dir)/submodules/externals/prebuilts/zrtpcpp.mk
+endif
 endif
 
 ifeq ($(BUILD_SRTP), 1)