tzname[] has an invalid values which produces a 
"General Protection Fault" independent from
was tzset() called or not.
Also daylight, timezone, altzone are absent but
they are UNIX-standard variables and used in 
several programs.

/*
   Compile and link this module to your program
   if you want to use tzname[] without getting a SIGSEGV.
*/

#include <time.h>

static void __attribute__ ((constructor)) Set_tzname(void)
{
  time_t ti;
  struct tm* tm;

  time(&ti);
  tzset();

  tm = gmtime(&ti);
  tm->tm_mon = 1;
  tm->tm_mday = 1;
  ti = mktime(tm);
  tm = localtime(&ti);
  tzname[0] = tm->tm_zone;

  tm = gmtime(&ti);
  tm->tm_mon = 7;
  tm->tm_mday = 1;
  ti = mktime(tm);
  tm = localtime(&ti);
  tzname[1] = tm->tm_zone;
}

Upgrade to v2.02, there are no GPFs there.