diff --git a/Shape_detection/benchmark/Shape_detection/CMakeLists.txt b/Shape_detection/benchmark/Shape_detection/CMakeLists.txt
index 4f2cf425d37..0534f795c1d 100644
--- a/Shape_detection/benchmark/Shape_detection/CMakeLists.txt
+++ b/Shape_detection/benchmark/Shape_detection/CMakeLists.txt
@@ -13,6 +13,8 @@ include(CGAL_CreateSingleSourceCGALProgram)
 find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
 include(CGAL_Eigen3_support)
 if(TARGET CGAL::Eigen3_support)
+  message(STATUS "Found Eigen 3")
+
   create_single_source_cgal_program(
     "benchmark_region_growing_on_point_set_2.cpp")
   target_link_libraries(
diff --git a/Shape_detection/examples/Shape_detection/CMakeLists.txt b/Shape_detection/examples/Shape_detection/CMakeLists.txt
index d9d47fd19c0..92249b2930b 100644
--- a/Shape_detection/examples/Shape_detection/CMakeLists.txt
+++ b/Shape_detection/examples/Shape_detection/CMakeLists.txt
@@ -13,6 +13,8 @@ include(CGAL_CreateSingleSourceCGALProgram)
 find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
 include(CGAL_Eigen3_support)
 if(TARGET CGAL::Eigen3_support)
+  message(STATUS "Found Eigen 3")
+
   create_single_source_cgal_program("efficient_RANSAC_basic.cpp")
   create_single_source_cgal_program("efficient_RANSAC_with_callback.cpp")
   create_single_source_cgal_program("region_growing_with_custom_classes.cpp")
diff --git a/Shape_detection/test/Shape_detection/CMakeLists.txt b/Shape_detection/test/Shape_detection/CMakeLists.txt
index e4e947c03c3..318096fc9bd 100644
--- a/Shape_detection/test/Shape_detection/CMakeLists.txt
+++ b/Shape_detection/test/Shape_detection/CMakeLists.txt
@@ -13,6 +13,8 @@ include(CGAL_CreateSingleSourceCGALProgram)
 find_package(Eigen3 3.1.0 QUIET) # (3.1.0 or greater)
 include(CGAL_Eigen3_support)
 if(EIGEN3_FOUND)
+  message(STATUS "Found Eigen 3")
+
   create_single_source_cgal_program("test_region_growing_basic.cpp")
   create_single_source_cgal_program("test_region_growing_strict.cpp")
   create_single_source_cgal_program("test_region_growing_on_cube.cpp")