diff --git a/modules/gralloc/framebuffer.cpp b/modules/gralloc/framebuffer.cpp
index 486e27a..eadcdaa 100644
--- a/modules/gralloc/framebuffer.cpp
+++ b/modules/gralloc/framebuffer.cpp
@@ -33,7 +33,7 @@
 #include <cutils/log.h>
 #include <cutils/atomic.h>
 
-#if HAVE_ANDROID_OS
+#ifdef __ANDROID__
 #include <linux/fb.h>
 #endif
 
diff --git a/modules/sensors/multihal.cpp b/modules/sensors/multihal.cpp
index 5fedd4d..8330ff3 100644
--- a/modules/sensors/multihal.cpp
+++ b/modules/sensors/multihal.cpp
@@ -36,6 +36,8 @@
 #include <dlfcn.h>
 #include <SensorEventQueue.h>
 
+#include <limits.h>
+#include <stdlib.h>
 
 static const char* CONFIG_FILENAME = "/system/etc/sensors/hals.conf";
 static const int MAX_CONF_LINE_LENGTH = 1024;
diff --git a/modules/usbaudio/audio_hal.c b/modules/usbaudio/audio_hal.c
index bbea5f5..38fea86 100644
--- a/modules/usbaudio/audio_hal.c
+++ b/modules/usbaudio/audio_hal.c
@@ -442,8 +442,16 @@
 static int out_get_presentation_position(const struct audio_stream_out *stream,
                                          uint64_t *frames, struct timespec *timestamp)
 {
-    /* FIXME - This needs to be implemented */
-    return -EINVAL;
+    struct stream_out *out = (struct stream_out *)stream; // discard const qualifier
+    lock_output_stream(out);
+
+    const alsa_device_proxy *proxy = &out->proxy;
+    const int ret = proxy_get_presentation_position(proxy, frames, timestamp);
+
+    pthread_mutex_unlock(&out->lock);
+    ALOGV("out_get_presentation_position() status:%d  frames:%llu",
+            ret, (unsigned long long)*frames);
+    return ret;
 }
 
 static int out_add_audio_effect(const struct audio_stream *stream, effect_handle_t effect)