[Ltib] How to make a package build before another package

[Lv Terry-R65388]

Hi experts,

        In my ltib, a egl library need to use gpu's library. Thus the gpu 
library need to be built first.

        I add a dependency in lkc file.

config PKG_GST_PLUGINS_GL
    select PKG_GST_FSL_PLUGINS
    bool "gst-plugins-gl"
    depends on PKG_GPU_VIV_BIN_MX6Q
    help
         This package provides the Freescale Gstreamer based plugins on OpenGl.

        But it seems it doesn't work. PKG_GST_PLUGINS_GL still builds first.

        In .config file, I can see that PKG_GPU_VIV_BIN_MX6Q is in front of 
PKG_GST_PLUGINS_GL.
CONFIG_PKG_GPU_VIV_BIN_MX6Q=y
# CONFIG_PKG_UUC is not set
# CONFIG_PKG_ATHEROS_WIFI is not set
CONFIG_PKG_PERF=y

#
# Freescale Multimedia Plugins/Codecs
#
CONFIG_PKG_LIBFSLCODEC=y
CONFIG_PKG_LIBFSLPARSER=y
CONFIG_PKG_LIBFSLVPUWRAP=y
# CONFIG_PKG_LIBFSLAACPCODEC is not set
# CONFIG_PKG_LIBFSLAC3CODEC is not set
# CONFIG_PKG_LIBFSLMSCODEC is not set
# CONFIG_PKG_LIBFSLMSPARSER is not set
CONFIG_PKG_GST_FSL_PLUGINS=y
CONFIG_PKG_GST_PLUGINS_GL=y

        How to resolve this problem?

        Thanks a lot~~

Yours
Terry