~/MagicMirror/node_modules/.bin/electron-rebuild

Thank you for the help. I was able to install electron-rebuild, but running the second command gets me this:

pi@raspberrypi:~/MagicMirror/modules/MMM-FlightTracker $ ~/MagicMirror/node_modules/.bin/electron-rebuild
⠦ Building module: rtl-sdr, Completed: 0make: Entering directory '/home/pi/MagicMirror/modules/MMM-FlightTracker/node_modules/rtl-sdr/build'
  CXX(target) Release/obj.target/rtlsdr/src/binding.o
⠋ Building module: rtl-sdr, Completed: 0In file included from /home/pi/.electron-gyp/13.5.1/include/node/node.h:67,
                 from ../../nan/nan.h:54,
                 from ../src/binding.cc:1:
/home/pi/.electron-gyp/13.5.1/include/node/v8.h:1670:79: warning: ‘ResolveCallback’ is deprecated [-Wdeprecated-declarations]
                                                      ResolveCallback callback);
                                                                              ^

⠦ Building module: rtl-sdr, Completed: 0/home/pi/.electron-gyp/13.5.1/include/node/v8.h:8652:51: warning: ‘HostImportModuleDynamicallyCallback’ is deprecated [-Wdeprecated-declarations]
       HostImportModuleDynamicallyCallback callback);
                                                   ^
⠏ Building module: rtl-sdr, Completed: 0In file included from ../src/binding.cc:1:
../../nan/nan.h: In function ‘void Nan::AsyncQueueWorker(Nan::AsyncWorker*)’:
../../nan/nan.h:2298:62: warning: cast between incompatible function types from ‘void (*)(uv_work_t*)’ {aka ‘void (*)(uv_work_s*)’} to ‘uv_after_work_cb’ {aka ‘void (*)(uv_work_s*, int)’} [-Wcast-function-type]
     , reinterpret_cast<uv_after_work_cb>(AsyncExecuteComplete)
                                                              ^
⠙ Building module: rtl-sdr, Completed: 0In file included from ../../nan/nan.h:2884,
                 from ../src/binding.cc:1:
../../nan/nan_typedarray_contents.h: In constructor ‘Nan::TypedArrayContents<T>::TypedArrayContents(v8::Local<v8::Value>)’:
../../nan/nan_typedarray_contents.h:34:43: error: ‘class v8::ArrayBuffer’ has no member named ‘GetContents’; did you mean ‘IsContext’?
       data   = static_cast<char*>(buffer->GetContents().Data()) + byte_offset;
                                           ^~~~~~~~~~~
                                           IsContext
⠼ Building module: rtl-sdr, Completed: 0In file included from ../../nan/nan.h:54,
                 from ../src/binding.cc:1:
../src/binding.cc: At global scope:
/home/pi/.electron-gyp/13.5.1/include/node/node.h:770:43: warning: cast between incompatible function types from ‘void (*)(Nan::ADDON_REGISTER_FUNCTION_ARGS_TYPE)’ {aka ‘void (*)(v8::Local<v8::Object>)’} to ‘node::addon_register_func’ {aka ‘void (*)(v8::Local<v8::Object>, v8::Local<v8::Value>, void*)’} [-Wcast-function-type]
       (node::addon_register_func) (regfunc),                          \
                                           ^
/home/pi/.electron-gyp/13.5.1/include/node/node.h:804:3: note: in expansion of macro ‘NODE_MODULE_X’
   NODE_MODULE_X(modname, regfunc, NULL, 0)  // NOLINT (readability/null_usage)
   ^~~~~~~~~~~~~
../src/binding.cc:319:1: note: in expansion of macro ‘NODE_MODULE’
 NODE_MODULE(rtlsdr, Init)
 ^~~~~~~~~~~
⠼ Building module: rtl-sdr, Completed: 0make: *** [rtlsdr.target.mk:111: Release/obj.target/rtlsdr/src/binding.o] Error 1
make: Leaving directory '/home/pi/MagicMirror/modules/MMM-FlightTracker/node_modules/rtl-sdr/build'
✖ Rebuild Failed

An unhandled error occurred inside electron-rebuild
node-gyp failed to rebuild '/home/pi/MagicMirror/modules/MMM-FlightTracker/node_modules/rtl-sdr'.
For more information, rerun with the DEBUG environment variable set to "electron-rebuild".

Error: `make` failed with exit code: 2



Error: node-gyp failed to rebuild '/home/pi/MagicMirror/modules/MMM-FlightTracker/node_modules/rtl-sdr'.
For more information, rerun with the DEBUG environment variable set to "electron-rebuild".

Error: `make` failed with exit code: 2


    at NodeGyp.rebuildModule (/home/pi/MagicMirror/node_modules/electron-rebuild/lib/src/module-type/node-gyp.js:109:19)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async ModuleRebuilder.rebuildNodeGypModule (/home/pi/MagicMirror/node_modules/electron-rebuild/lib/src/module-rebuilder.js:94:9)
    at async Rebuilder.rebuildModuleAt (/home/pi/MagicMirror/node_modules/electron-rebuild/lib/src/rebuild.js:226:9)
    at async Rebuilder.rebuild (/home/pi/MagicMirror/node_modules/electron-rebuild/lib/src/rebuild.js:184:17)
    at async /home/pi/MagicMirror/node_modules/electron-rebuild/lib/src/cli.js:154:9

npm install electron-rebuild

in the module folder do

~/MagicMirror/node_modules/.bin/electron-rebuild

note the dot (.) in front of bin