Sun Solaris (2.5.1+) build gets configured
with undefined HAVE_TZSET *and* undefined
This leads to multiple threads calling the
MT-unsafe tzset() function in tclClock.c
which brings MT-enabled Tcl shell to core.
This happens for at least Tcl8.3.4
(and maybe lower) and for Tcl8.4a4
and (probably) others as well.
The wording from FormatClock() function
in tclClock.c:272 says:
* Some systems forgot to call tzset in localtime, make
sure its done.
So I think, the Sun Solaris should also
be included in this list. This should
be changed in the tcl.m4 which already
covers this case for ULTRIX-4-* and