Migration 3.7 to 3.8 - GRC OOT module fails to import multi_usrp

[Criss Swaim]

I am running Fedora 33, GnuRadio 3.8.2 and UHD 3.15.  GnuRadio/UHD was
installed from the dnf package with the following command:

> dnf install -y gnuradio3.8 uhd-devel gnuradio-devel uhd-tools

Following the OOT tutorial I have updated the cmake as follows:

> 3.7.2
> set(GR_REQUIRED_COMPONENTS RUNTIME PMT UHD)
> find_package(Gnuradio "3.7.2" REQUIRED)
>
> 3.8.2
> find_package(Gnuradio "3.8" REQUIRED COMPONENTS UHD)
> include(GrVersion)
After compiling my OOT module, the compile is clean, but running the
block in grc I receive an error.

> ImportError:
> /home/sensor/qn382/gr-vandevender/build/lib/libgnuradio-vandevender.so.1.0.0git:
> undefined symbol: _ZN3uhd4usrp10multi_usrp9ALL_CHANSE

in the OOTcmodule, there is this line of code:

> usrp = uhd::usrp::multi_usrp::make(ip_addr);
To debug, I opened ipython and imported the swig file and am receiving
the following error (thank you Martin Braun for this debugging tip):

> In [1]: import swig._vandevender_swig
> ---------------------------------------------------------------------------
> ImportError                               Traceback (most recent call
> last)
> <ipython-input-1-48c182e2abc0> in <module>
> ----> 1 import swig._vandevender_swig
>
> ImportError:
> /home/sensor/qn382/gr-vandevender/build/lib/libgnuradio-vandevender.so.1.0.0git:
> undefined symbol: _ZN3uhd4usrp10multi_usrp9ALL_CHANSE
In ipython, I have imported uhd.usrp and dir(uhd.usrp.lib.usrp) finds
the multi_ursp function is found,  

So I suspect I need something, somewhere in the CMake file is needed to
point swig to the correct python module uhd.usrp.lib.usrp.  But I am
lost.  Is this even the correct area?  Are there other areas I need to
look into?  This is my first exposure to the 'modern CMake', so if the
problem is in it, some specific guidance would be appreciated.

-- 
Criss Swaim
cswaim@tpginc.net
cell: 505.301.5701