M1 macbookでemacsのbuild

M1 macbookが来たので早速emacsのbuild。

普通にやると下記のようなエラーがでるので、arch -x86_64 をつけてrosetta上でやるとうまくいく。
configure: error: Emacs does not support 'arm-apple-darwin20.1.0' systems.

$ arch -x86_64 bash
The default interactive shell is now zsh.
To update your account to use zsh, please run `chsh -s /bin/zsh`.
For more details, please visit https://support.apple.com/kb/HT208050.
bash-3.2$ ./configure --prefix=${HOME}/local --without-x --with-gnutls=no --with-mailutils
checking for xcrun... xcrun
checking for make... yes
checking for GNU Make... make
checking build system type... x86_64-apple-darwin20.1.0
checking host system type... x86_64-apple-darwin20.1.0
checking for gcc... gcc
...

$ make
/Applications/Xcode.app/Contents/Developer/usr/bin/make -C lib all
  GEN      alloca.h
  GEN      byteswap.h
...

bash-3.2$ ./src/emacs --version
GNU Emacs 27.1
Copyright (C) 2020 Free Software Foundation, Inc.
GNU Emacs comes with ABSOLUTELY NO WARRANTY.
You may redistribute copies of GNU Emacs
under the terms of the GNU General Public License.
For more information about these matters, see the file named COPYING.