diff --git a/media/webrtc/trunk/gtest/moz.build b/media/webrtc/trunk/gtest/moz.build
--- a/media/webrtc/trunk/gtest/moz.build
+++ b/media/webrtc/trunk/gtest/moz.build
@@ -25,30 +25,38 @@ LOCAL_INCLUDES += [
     '/media/libopus/include',
     '/media/libopus/src',
 ]
 
 USE_LIBS += [
     '/media/webrtc/trunk/third_party/gflags/gflags_gflags/gflags',
     '/testing/gtest/gtest',
-    'media_libjpeg',
     'media_libopus',
-    'media_libvpx',
     'mozglue',
     'speex',
     'webrtc',
     'webrtc_common',
     'webrtc_i420',
     'webrtc_lib',
     'webrtc_utility',
     'webrtc_vp8',
     'webrtc_vp9',
     'yuv',
 ]
 
+if CONFIG['MOZ_SYSTEM_JPEG']:
+    OS_LIBS += CONFIG['MOZ_JPEG_LIBS']
+else:
+    USE_LIBS += ['media_libjpeg']
+
+if CONFIG['MOZ_SYSTEM_LIBVPX']:
+    OS_LIBS += CONFIG['MOZ_LIBVPX_LIBS']
+else:
+    USE_LIBS += ['media_libvpx']
+
 if CONFIG['OS_TARGET'] in ['Darwin', 'Linux', 'WINNT']:
     if CONFIG['OS_TARGET'] == 'Linux':
         DEFINES['WEBRTC_LINUX'] = True
         DEFINES['WEBRTC_POSIX'] = True
 
         LOCAL_INCLUDES += [
             '../third_party/gflags/gen/posix/include',