I downloaded the latest community edition 3.6.5 installer from the website and tried to run mongo and mongod, but both failed with errors:

Downloads$ cd mongodb-osx-x86_64-3.6.5/bin
bin$ ls
bsondump mongod mongofiles mongoreplay mongostat
install_compass mongodump mongoimport mongorestore mongotop
mongo mongoexport mongoperf mongos
bin$ ./mongo --version
dyld: Symbol not found: _fchmodat
Referenced from: /Users/vagrant/Downloads/mongodb-osx-x86_64-3.6.5/bin/./mongo
Expected in: /usr/lib/libSystem.B.dylib
in /Users/vagrant/Downloads/mongodb-osx-x86_64-3.6.5/bin/./mongo
Trace/BPT trap: 5
bin$ ./mongod --version
dyld: Symbol not found: _fchmodat
Referenced from: /Users/vagrant/Downloads/mongodb-osx-x86_64-3.6.5/bin/./mongod
Expected in: /usr/lib/libSystem.B.dylib
in /Users/vagrant/Downloads/mongodb-osx-x86_64-3.6.5/bin/./mongod
Trace/BPT trap: 5
bin$