Add Eigen3 to the public dependencies of the CMake config file

Author: traversaro

CMakeLists.txt

@@ -77,7 +77,7 @@ install_basic_package_files(${PROJECT_NAME}
                             NO_SET_AND_CHECK_MACRO
                             VARS_PREFIX ${PROJECT_NAME}
                             NO_CHECK_REQUIRED_COMPONENTS_MACRO
-                            DEPENDENCIES Threads)
+                            DEPENDENCIES Eigen3 Threads)
 
 # Add the uninstall target
 include(AddUninstallTarget)