.SH AVAILABILITY
Both functions are available under glibc2, but not under libc5.
However,
-.B logwtmp
+.BR logwtmp ()
used to occur in the old libbsd. These days, the
-.B logwtmp
+.BR logwtmp ()
function is included in libutil. (Hence you'll need to add
.B \-lutil
to your compiler command line to get it.)