sysctl calls from userland

Looking through the dmesg(1) output from the kernel I built
this morning
from Linus' git tree, I saw a few:

 warning: process `date' used the removed sysctl system call

Other programs listed as using sysctl are: kmodule, ls,
kudzu, sleep
newaliases, sendmail and dbus-daemon.

Looking at "sleep", I found that the sysctl() call
was made before
getting to main().  The issue is all the code dragged in by
"-lrt".
A simple test case:

$ cat nop.c
main() {}
$ gcc -o nop nop.c -lrt
$ strace -o nop.out ./nop
$ grep sysctl nop.out
_sysctl(0x60000ffffe97f3c0)           = 0
$

Is my userland too old (vintage RHEL4u1)?

-Tony
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