--- CMakeLists.txt.orig	2021-09-07 15:43:33 UTC
+++ CMakeLists.txt
@@ -22,7 +22,9 @@ dune_register_package_flags(LIBRARIES dunegridglue)
 
 add_subdirectory("dune")
 add_subdirectory("doc")
+if (FREEBSD_BUILD_EXAMPLES)
 add_subdirectory("examples")
+endif()
 
 # finalize the dune project, e.g. generating config.h etc.
 finalize_dune_project(GENERATE_CONFIG_H_CMAKE)