Using appsink on Ubuntu

[aweston5]

Hi, I'm trying to include this in a program to use AppSink and this file
isn't found ...

#include <gst/app/gstappsink.h>

I'm on Ubuntu 16, and this file isn't found using:  
find / -name gstappsink.h

I installed with this:   
apt-get install -y gstreamer1.0*

Which puts files here:  /usr/include/gstreamer-1.0/gst

But there is no gst/app directory?

What do I have to install to get this?  Is there a dev package?  I seem to
have everything that I can find.
Thanks
--Andy







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