the problem of "undefined symbol: gst_base_src_get_type"

[xl2012]

I want to produce a plugin by gst-template.
Then I install it ,but,when I do gst-inspect mydemosrc,
it result that:
libgstmydemosrc: undefined symbol: gst_base_src_get_type.

second,I find configure.ac, shows:
PKG_CHECK_MODULES(GST_BASE, gstreamer-base-$GST_MAJORMINOR >= $GST_REQUIRED,
                  HAVE_GST_BASE=yes, HAVE_GST_BASE=no)

gstreamer-base-0.10 is including??

and the configure.log shows gstreamer-base-0.10 yes

why it results "undefined symbol: gst_base_src_get_type."??

someone can help me?
thank you



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