Usrp1_make_source libraries

GNU Radio
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Hi Eric,

I was trying to use the usrp1_make_source_c and other functions in the
usrp1_source_c.cc and usrp1_sink_c.cc files. When I tried to compile and
link my code thats uses these functions with the gnuradio-core
libraries, it fails. It says undefined reference.

Is there some other library for the usrp code? Or is there some other
C++ functions that I can call?

Thanks,
Gesly