-- Doxygen found. Contract documentation will be generated.
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
EOS_LIBBSONCXX
linked by target "db_plugin" in directory /home/ksgt/eos/plugins/db_plugin
EOS_LIBMONGOCXX
linked by target "db_plugin" in directory /home/ksgt/eos/plugins/db_plugin

-- Configuring incomplete, errors occurred!
See also "/home/ksgt/eos/build/CMakeFiles/CMakeOutput.log".
make: *** No targets specified and no makefile found. Stop.

出现了这种问题是什么原因？