Use tm.tm_zone only when defined.

scsh/time1.c

@@ -3,7 +3,7 @@
 */
 
 /* The source code is conditionalised by three #ifdef feature macros:
-** HAVE_TZNAME
+** HAVE_STRUCT_TM_TM_ZONE/HAVE_TZNAME
 **   The char *tzname[2] global variable is POSIX. Everyone provides
 **   it...except some "classic" versions of SunOS that we still care about
 **   running (People in LCS/AI refuse to switch to Solaris). So, we kluge
@@ -161,10 +161,12 @@ s48_value time2date(s48_value sch_t, s48_value sch_zone)
 	** that happens.
 	*/
 	{ int error = 0;
-#ifndef HAVE_TZNAME
-	  char *zone = d.tm_zone; /* Hack it for SunOS. */
-#else
+#ifdef HAVE_TZNAME
 	  char *zone = tzname[d.tm_isdst];
+#else
+#ifdef HAVE_STRUCT_TM_TM_ZONE
+	  const char *zone = d.tm_zone; /* Hack it for SunOS. */
+#endif
 #endif
 	  char *newzone = Malloc(char, 1+strlen(zone));
 	  if( newzone ){
@@ -330,7 +332,7 @@ s48_value format_date(s48_value sch_fmt, s48_value sch_sec, s48_value sch_min,
     d.tm_yday = s48_extract_fixnum(sch_year_day);
     d.tm_isdst = (S48_EQ_P (sch_summer, S48_FALSE)) ? 0 : 1;
 
-#ifdef HAVE_TM_ZONE
+#ifdef HAVE_STRUCT_TM_TM_ZONE
     d.tm_zone = s48_extract_string(sch_tz); /* FreeBSD's strftime reads this */
 #endif