1 Use relative fcronsighup to prefer setuid executable over package binary.
2 --- fcron-3.2.1.orig/fcrontab.c 2016-06-26 17:02:48.000000000 +0200
3 +++ fcron-3.2.1/fcrontab.c 2017-03-05 21:54:24.676871335 +0100
8 - execl(BINDIREX "/fcronsighup", BINDIREX "/fcronsighup", fcronconf,
9 + execlp("fcronsighup", "fcronsighup", fcronconf,
12 - error_e("Could not exec " BINDIREX " fcronsighup");
13 + error_e("Could not exec fcronsighup");