> Thank you! I didn't do that, but will try it now.
Alas, I didn't get far. (See attached.)
It appears that <gcc> on OS X expects <i386>, <ppc> or <ppc64> as the
value of <-arch>. But that doesn't seem to be what this error is
complaining about.
I have machines running 10.6 at home. I'll see whether this works there.
bash-3.2$ etc/make-liarc.sh 'CFLAGS=-arch x86_64'
run_cmd: ./configure --prefix=/Users/arthur/Downloads/Scheme/MIT
Scheme/mit-scheme-c-20090107/src/boot-root --enable-native-code=c
configure: WARNING: you should use --build, --host, --target
configure: WARNING: invalid host type:
Scheme/mit-scheme-c-20090107/src/boot-root
checking whether make sets $(MAKE)... yes
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... yes
Makefiles already created.
configure: creating ./config.status
config.status: creating Makefile
config.status: creating 6001/Makefile
config.status: creating compiler/Makefile
config.status: creating cref/Makefile
config.status: creating edwin/Makefile
config.status: creating imail/Makefile
config.status: creating runtime/Makefile
config.status: creating sf/Makefile
config.status: creating sos/Makefile
config.status: creating ssp/Makefile
config.status: creating star-parser/Makefile
config.status: creating win32/Makefile
config.status: creating xdoc/Makefile
config.status: creating xml/Makefile
=== configuring in microcode (/Users/arthur/Downloads/Scheme/MIT
Scheme/mit-scheme-c-20090107/src/microcode)
configure: running /bin/sh ./configure
'--prefix=/Users/arthur/Downloads/Scheme/MIT'
'Scheme/mit-scheme-c-20090107/src/boot-root' '--enable-native-code=c'
'build_alias=Scheme/mit-scheme-c-20090107/src/boot-root'
'host_alias=Scheme/mit-scheme-c-20090107/src/boot-root'
'target_alias=Scheme/mit-scheme-c-20090107/src/boot-root'
--cache-file=/dev/null --srcdir=.
configure: WARNING: you should use --build, --host, --target
configure: WARNING: invalid host type:
Scheme/mit-scheme-c-20090107/src/boot-root
checking whether make sets $(MAKE)... yes
checking build system type... Invalid configuration
`Scheme/mit-scheme-c-20090107/src/boot-root': machine
`Scheme/mit-scheme-c-20090107/src/boot' not recognized
configure: error: /bin/sh ./config.sub
Scheme/mit-scheme-c-20090107/src/boot-root failed
configure: error: ./configure failed for microcode
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