Gr-osmosdr cpp enabling

I like to save script made with grc not in pyton, but in cpp, but I get error that block gr-osmosdr don’t allow cpp. I installed binary package on Arch linux, presume that I need to compile gr-osmosdr block from source. What would be the right way to compile osmo block supporting cpp. I found this example, what is confusing me that also other block like sink or source hardware/soapy wrappers also not supporting cpp, and this blocks came with gnuradio binary package, I’m not sure if I need to enable cpp on gnuradio level or it’s per block enable/disable option.