How to link google protobuf libraries via cmake on linux?

I'm trying to make it same way I made it for boost :

find_package(Boost COMPONENTS system filesystem REQUIRED)                                                    
find_package(ProtocolBuffers)                                                                                

## Compiler flags                                                                                            
if(CMAKE_COMPILER_IS_GNUCXX)                                                                                 
    set(CMAKE_CXX_FLAGS "-O2")                                                                               
    set(CMAKE_EXE_LINKER_FLAGS "-lsqlite3 -lrt -lpthread")                                                   
endif()                                                                                                      

target_link_libraries(complex                                                                                
  ${Boost_FILESYSTEM_LIBRARY}                                                                                
  ${Boost_SYSTEM_LIBRARY}                                                                                    
  ${PROTOBUF_LIBRARY}                                                                                        
)  

(googled it somewhere) but got bad output:

CMake Warning at complex/CMakeLists.txt:18 (find_package):
  Could not find module FindProtocolBuffers.cmake or a configuration file for
  package ProtocolBuffers.

  Adjust CMAKE_MODULE_PATH to find FindProtocolBuffers.cmake or set
  ProtocolBuffers_DIR to the directory containing a CMake configuration file
  for ProtocolBuffers.  The file will have one of the following names:

    ProtocolBuffersConfig.cmake
    protocolbuffers-config.cmake

How can I link it with cmake? or maybe I even can compile .proto file using cmake?

You could try CMake's FindProtobuf module:

include(FindProtobuf)
find_package(Protobuf REQUIRED)
include_directories(${PROTOBUF_INCLUDE_DIR})
...
target_link_libraries(complex
    ${Boost_FILESYSTEM_LIBRARY}
    ${Boost_SYSTEM_LIBRARY}
    ${PROTOBUF_LIBRARY}
)

For further info, run

cmake --help-module FindProtobuf