here

ifeq ($(CONFIG_LIBFFMPEG_STATIC),yes)
CFLAGS  += -I${ROOTDIR}/libav_static/build/ffmpeg/include
LDFLAGS += -L${ROOTDIR}/libav_static/build/ffmpeg/lib -Wl,-Bstatic \
           -lavresample -lswresample -lswscale \
           -lavutil -lavformat -lavcodec -lavutil \
           -lvorbisenc -lvorbis -logg -lx264 -lx11 -lvpx \
           -Wl,-Bdynamic