--- configure.ac
+++ configure.ac
@@ -497,7 +497,7 @@
 AC_ARG_WITH([external-ffmpeg], AC_HELP_STRING([--with-external-ffmpeg], [use external ffmpeg library]))
 
 if test "x$with_external_ffmpeg" = "xyes"; then
-     PKG_CHECK_MODULES([FFMPEG_TEMP], [libavcodec libpostproc])
+     PKG_CHECK_MODULES([FFMPEG_TEMP], [libavcodec libpostproc libavutil])
      FFMPEG_FOLDER=""
      FFMPEG_EXTERNALTEXT="External ffmpeg"
 		   
@@ -515,10 +515,10 @@
      AC_MSG_RESULT($enable_ffmpeg_swscale)
      if test x"$enable_ffmpeg_swscale" = xyes; then
 	     dnl AC_DEFINE(HAVE_SWSCALER)
-	     PKG_CHECK_MODULES([FFMPEG], [libavcodec libpostproc libswscale])
+	     PKG_CHECK_MODULES([FFMPEG], [libavcodec libpostproc libswscale libavutil])
 	     FFMPEG_CFLAGS="$FFMPEG_CFLAGS -I/usr/include/libavcodec -I/usr/include/libswscale -DHAVE_SWSCALER"
      else
-	     PKG_CHECK_MODULES([FFMPEG], [libavcodec libpostproc])
+	     PKG_CHECK_MODULES([FFMPEG], [libavcodec libpostproc libavutil])
      fi
      FFMPEG_EXTERNALTEXT="External ffmpeg"
 else