What is going on with this forum!! It seems to keep loosing bits of my post!
Ok, to continue, this is what I get:
-- Build type not specified: defaulting to release. -- libsdrplay not found. CMake Error at CMakeLists.txt:16 (message): SDRplay development files not found... -- Configuring incomplete, errors occurred! See also "/home/johnc/src/SoapySDRPlay/build/CMakeFiles/CMakeOutput.log".
I have installed libpython3.dbg and libpython3.9.dbg libraries but this makes no difference. I am wondering whether I need to solve this first problem with the debug library in order to get the second library compiled?