Now the make clean executed in the build folder don't delete the READMEs from the source folder anymore.
``` ~/repositories/kamailio$ cmake --build build/ [..] ~/repositories/kamailio$ cd build/ ~/repositories/kamailio/build$ make clean ~/repositories/kamailio/build$ cd .. ~/repositories/kamailio$ find . -name "README" ./utils/kamctl/README ./utils/kamctl/oracle/admin/README [..] ```
This issue could be probably closed then, if there are no other related topics.