Can't build on Ubuntu - nlohmann/json.hpp: No such file or directory

[atlex]

Operating System: Ubuntu 22.04.4 LTS
Kernel: Linux 6.5.0-28-generic

$ make

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/home/pi/cpp-sdrtrunk-transcriber/src/transcriptionProcessor.cpp:15:10: fatal error: nlohmann/json.hpp: No such file or directory
15 | #include <nlohmann/json.hpp>
| ^~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/sdrTrunkTranscriber.dir/build.make:146: CMakeFiles/sdrTrunkTranscriber.dir/src/transcriptionProcessor.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [CMakeFiles/Makefile2:219: CMakeFiles/sdrTrunkTranscriber.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

[atlex]

Any Ideas?