made implementation defined behaviour (POSIX) more explicit
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			@ -233,6 +233,15 @@ parseTZ(const char *p)
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	if (!p) return;
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	if (*p == ':') {
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		/*
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		 * According to POSIX, this is implementation defined.
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		 * Since it depends on the particular operating system, we
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		 * can do nothing.
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		 */
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		return;
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	}
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	if (!strcmp(lastTZ, p)) return;		/* nothing changed */
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	*_tzname[0] = '\0';
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