diff --git a/android/opensl_io.c b/android/opensl_io.c
index 38b6ec0..0af9bc5 100644
--- a/android/opensl_io.c
+++ b/android/opensl_io.c
@@ -512,7 +512,7 @@ int waitThreadLock(void *lock)
   }
   p->s = (unsigned char) 0;
   pthread_mutex_unlock(&(p->m));
-  return NULL;
+  return 0;
 }
 
 void notifyThreadLock(void *lock)
diff --git a/wscript b/wscript
index 86eb395..09b0411 100644
--- a/wscript
+++ b/wscript
@@ -699,6 +699,11 @@ def build_drivers(bld):
         'solaris/oss/JackOSSDriver.cpp'
     ]
 
+    opensles_src = [
+        'android/JackOpenSLESDriver.cpp', 
+        'android/opensl_io.c'
+    ]
+
     portaudio_src = [
         'windows/portaudio/JackPortAudioDevices.cpp',
         'windows/portaudio/JackPortAudioDriver.cpp',
@@ -741,6 +746,12 @@ def build_drivers(bld):
 
     # Create hardware driver objects. Lexically sorted after the conditional,
     # e.g. BUILD_DRIVER_ALSA.
+    create_driver_obj(
+        bld,
+        target='opensles',
+        source=opensles_src, 
+        lib=['OpenSLES'])
+    
     if bld.env['BUILD_DRIVER_ALSA']:
         create_driver_obj(
             bld,