Forum: GNU Radio Error when compiling signal processing block

Hi all,

I am trying to create my own version of a UHD USRP Sink. I am 
essentially
trying to get the current uhd_usrp_sink code to work in my own module 
right
now and I have narrowed down my errors to only one centered around the
gr_uhd_check_abi function. I don't really know what it does or where it 
is
declared. I searched around and could not find what it does or where the
function is actually defined within the GNU Radio framework. I feel like 
I
may be missing an include statement, but I'm not even sure that's the
problem. My code is almost identical to the code in the uhd_usrp_sink 
.cc
and .h files. If anyone else has had this error or knows how to fix it I
would greatly appreciate your feedback. I have included the error output
below.

Thanks,
ONU SDR Team

/home/sdr/RadarWaveforms/gr-radar/lib/lfm_sink_impl.cc: In function
boost::shared_ptr<uhd_usrp_lfm_sink> uhd_make_usrp_lfm_sink(const
uhd::device_addr_t&, const uhd::stream_args_t&):
/home/sdr/RadarWaveforms/gr-radar/lib/lfm_sink_impl.cc:510:22: error:
gr_uhd_check_abi was not declared in this scope