Update cmake configuration from master

doc/examples/CMakeLists.txt

@@ -6,6 +6,7 @@ foreach(example_src ${examples_SRCS})
   if(EIGEN_STANDARD_LIBRARIES_TO_LINK_TO)
     target_link_libraries(${example} ${EIGEN_STANDARD_LIBRARIES_TO_LINK_TO})
   endif()
+  target_link_libraries(${example} Eigen3::Eigen)
   add_custom_command(
     TARGET ${example}
     POST_BUILD
@@ -13,8 +14,4 @@ foreach(example_src ${examples_SRCS})
     ARGS >${CMAKE_CURRENT_BINARY_DIR}/${example}.out
   )
   add_dependencies(all_examples ${example})
-endforeach()
-
-if(EIGEN_COMPILER_SUPPORT_CPP11)
-ei_add_target_property(nullary_indexing COMPILE_FLAGS "-std=c++11")
-endif()
+endforeach()