Jimo

Thanks for the help. I did get it working! (-:
I am using Ubuntu 18.04 LTS and installed GNU Radio 3.7.11 from the Software Centre, which is latest version offered.

I found that running the following worked:

git clone --single-branch --branch maint-3.7 --recurse-submodules https://github.com/hcab14/gr-kiwisdr.git
cd gr-kiwisdr
mkdir build
cd build
cmake ../
sudo make install

Note: I had to use sudo 'make install' (a permission thing)

Now I can see kiwisdr listed right at the bottom of all the blocks in GNU Radio.
kiwisdr
align_streams
coh_stream_syth
kiwi_wav_source
kiwisdr

Now to go and try get it all to work in GNU Radio.
Hope this will help you @WAZ2ZKD and I am sure will be needing more help @Christoph