diff --git a/ADApp/commonDriverMakefile b/ADApp/commonDriverMakefile
index a579265f..4253a8bd 100644
--- a/ADApp/commonDriverMakefile
+++ b/ADApp/commonDriverMakefile
@@ -224,7 +224,11 @@ endif
 ifdef FFMPEGSERVER
   $(DBD_NAME)_DBD += ffmpegServer.dbd
   PROD_LIBS       += ffmpegServer
-  PROD_LIBS       += avdevice avformat avcodec swresample swscale avutil
+  ifeq ($(FFMPEG_EXTERNAL), NO)
+    PROD_LIBS       += avdevice avformat avcodec swresample swscale avutil
+  else
+    PROD_SYS_LIBS += avdevice avformat avcodec swresample swscale avutil
+  endif
   PROD_SYS_LIBS   += lzma
 endif