+: see if localtime_r calls tzset
+case "$localtime_r_proto" in
+REENTRANT_PROTO*)
+ $cat >try.c <<EOCP
+/* Does our libc's localtime_r call tzset ?
+ * return 0 if so, 1 otherwise.
+ */
+#$i_systypes I_SYS_TYPES
+#$i_unistd I_UNISTD
+#$i_time I_TIME
+#$i_stdlib I_STDLIB
+#$i_malloc I_MALLOC
+#ifdef I_SYS_TYPES
+# include <sys/types.h>
+#endif
+#ifdef I_UNISTD
+# include <unistd.h>
+#endif
+#ifdef I_TIME
+# include <time.h>
+#endif
+#ifdef I_STDLIB
+#include <stdlib.h>
+#endif
+#include <string.h>
+#ifdef I_MALLOC
+# include <malloc.h>
+#endif
+int main()
+{
+ int result = 0;
+ time_t t = time(0L);
+ char w_tz[]="TZ" "=GMT+5",
+ e_tz[]="TZ" "=GMT-5",
+ *tz_e = (char*)malloc(16),
+ *tz_w = (char*)malloc(16);
+ struct tm tm_e, tm_w;
+ memset(&tm_e,'\0',sizeof(struct tm));
+ memset(&tm_w,'\0',sizeof(struct tm));
+ strcpy(tz_e,e_tz);
+ strcpy(tz_w,w_tz);
+
+ putenv(tz_e);
+ localtime_r(&t, &tm_e);
+
+ putenv(tz_w);
+ localtime_r(&t, &tm_w);
+
+ if( memcmp(&tm_e, &tm_w, sizeof(struct tm)) == 0 )
+ result = 1;
+
+ free(tz_e);free(tz_w);
+ return result;
+}
+EOCP
+ set try
+ if eval $compile; then
+ if $run ./try; then
+ d_localtime_r_needs_tzset=undef;
+ else
+ d_localtime_r_needs_tzset=define;
+ fi;
+ else
+ d_localtime_r_needs_tzset=undef;
+ fi;
+ ;;
+ *)
+ d_localtime_r_needs_tzset=undef;
+ ;;
+esac
+$rm_try
+