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diff -Nrup a/Makefile b/Makefile
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--- a/Makefile	2023-03-22 17:41:49.069789592 -0400
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+++ b/Makefile	2023-03-22 17:44:07.528427093 -0400
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@@ -52,7 +52,7 @@ LOCALTIME=	Factory
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 #	make zonenames
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 # to get a list of the values you can use for POSIXRULES.
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-POSIXRULES=	-
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+POSIXRULES=	America/New_York
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 # Also see TZDEFRULESTRING below, which takes effect only
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 # if POSIXRULES is '-' or if the template file cannot be accessed.
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Binary files a/tzdata2023a-rearguard.tar.gz and b/tzdata2023a-rearguard.tar.gz differ