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--- cl-original/tools/ccopts.sh	2023-11-01 09:49:13.035146404 +0100
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+++ cl-patched/tools/ccopts.sh	2023-11-01 10:14:41.633786631 +0100
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@@ -1062,7 +1062,7 @@
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 		if [ $GENERICBUILD -gt 0 ] ; then
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 			echo "  (Enabling lowest-common-denominator build options for cross-platform library)." >&2 ;
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 		else
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-			CCARGS="$CCARGS -march=x86-64-v3" ;
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+			CCARGS="$CCARGS -m64" ;
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 		fi
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 	elif [ "$COMPILER_VER" -ge 45 ] ; then
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 		if [ $GENERICBUILD -gt 0 ] ; then