portage

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--- make.conf.example
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+++ make.conf.example
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@@ -39,9 +39,24 @@
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 # -frecord-gcc-switches, since otherwise the check could result in false
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 # positive results.
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 #
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-# Please refer to the GCC manual for a list of possible values.
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+# -mcpu specifies the name of the target processor, optionally suffixed by one
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+# or more feature modifiers. -march and -mtune are automatically deduced,
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+# unless set as well.
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+# -march specifies the name of the target architecture, optionally suffixed
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+# by one or more feature modifiers.
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+# -mtune specifies the name of the target processor for which to tune
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+# performance of the code.
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+# Set -march and -mtune if you want to build binaries that run with the given
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+# architecture instructions and is tuned for a more specific CPU without
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+# using its added instructions.
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+# Set only -mcpu if you want to build binaries that are most optimal for the
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+# given CPU, but might not run on others.
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+#
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+# Please refer to the GCC manual "AArch64 Options" section for a list of
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+# possible architecture, CPU and feature values.
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 #
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 #CFLAGS="-O2 -pipe"
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+#CLFAGS="-O2 -pipe -mcpu=native"
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 #
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 # If you set a CFLAGS above, then this line will set your default C++ flags to
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 # the same settings.
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@@ -76,7 +91,7 @@
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 # DO NOT PUT ANYTHING BUT YOUR SPECIFIC ~ARCHITECTURE IN THE LIST.
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 # IF YOU ARE UNSURE OF YOUR ARCH, OR THE IMPLICATIONS, DO NOT MODIFY THIS.
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 #
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-#ACCEPT_KEYWORDS="~arch"
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+#ACCEPT_KEYWORDS="~arm64"
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 # ACCEPT_LICENSE is used to mask packages based on licensing restrictions.
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 # It may contain both license and group names, where group names are
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