problem was noticed by wlodek (and reproduced by me):

  make[4]: Entering directory
  `/home/wlodek/dev/ktest/src/bin/keactrl'

  /home/wlodek/dev/kea_test/tools/path_replacer.sh
  /home/wlodek/dev/kea_test/src/bin/keactrl/kea.conf.pre kea.conf

  /bin/bash: /home/wlodek/dev/kea_test/tools/path_replacer.sh: No
  such file or directory