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diff -up rpm-4.14.2/macros.in.pyerror rpm-4.14.2/macros.in
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--- rpm-4.14.2/macros.in.pyerror	2019-06-04 13:33:48.450727270 +0300
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+++ rpm-4.14.2/macros.in	2019-06-04 13:34:09.717695822 +0300
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@@ -50,7 +50,7 @@
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 %__mv			@__MV@
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 %__patch		@__PATCH@
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 %__perl			@__PERL@
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-%__python		@__PYTHON@
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+%__python		%{error:attempt to use unversioned python, define %%__python to %{_bindir}/python2 or %{_bindir}/python3 explicitly}
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 %__restorecon		@__RESTORECON@
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 %__rm			@__RM@
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 %__rsh			@__RSH@