gst_tag_xmp_list_schemas() linker error on Ubuntu

[David Walter]

Gstreamer 1.14.4 on a Jetson Nano running Ubuntu 18.04. I have no problem building and running a basic videotestsrc pipeline.

I am trying to add a custom XMP schema, starting with just listing the schemas using [gst_tag_xmp_list_schemas](https://gstreamer.freedesktop.org/documentation/tag/gsttagxmp.html?gi-language=c#gst_tag_xmp_list_schemas) but get a ‘undefined reference to ‘gst_tag_xmp_list_schemas’.

I am not able to access any of the functions in [gstxmptag.c](https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/blob/1.14.4/gst-libs/gst/tag/gstxmptag.c) either. Is this included in libgstreamer-plugins-base1.0-0?
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