[CMake] Fix missing dependency

benchmark/CMakeLists.txt

@@ -30,6 +30,7 @@ IF(NumExtraMacroArgs GREATER 0)
   IF(link_to_main_lib)
     SET_TARGET_PROPERTIES(${bench_name} PROPERTIES COMPILE_DEFINITIONS PINOCCHIO_SOURCE_DIR="${${PROJECT_NAME}_SOURCE_DIR}")
     TARGET_LINK_LIBRARIES(${bench_name} ${PROJECT_NAME})
+    PKG_CONFIG_USE_DEPENDENCY(${bench_name} eigen3)
   ENDIF(link_to_main_lib)
 ENDIF()
 ENDMACRO(ADD_BENCH)