use get_target_property hack for root nlohmann_json #440
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Our CMake build of libdave can't find
nlohmann_json
due to this issue.To avoid adding a
find_package
call for the private dependency, this updates the root lib CMakeLists.txt to leverage the same hack thatlib/hpke
was already using.It looks like CMake versions >= 3.26.0 may now have BUILD_LOCAL_INTERFACE to support this in a slightly cleaner way - let me know if you'd prefer to use that alternative.