From owner-freebsd-questions@FreeBSD.ORG  Wed Jan 11 11:04:47 2012
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Date: Wed, 11 Jan 2012 05:47:13 -0500
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From: "Thomas Mueller" <mueller23@insightbb.com>
To: freebsd-questions@freebsd.org
Subject: Building FreeBSD for two or more architectures but not all
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How would I build FreeBSD, in this case 9.0-RELEASE, for two or more architectures, in this case i386 and amd64?

One build (amd64) would update the present system (9.0 RC3), but the other would go on a USB stick, likely 16 GB.

Real question is how to keep things like /usr/obj and other things from the two builds separate.

I don't want to 'make universe' when I won't run on anything other than i386 and amd64.

I want to build both on the new computer because the old computer is short on disk space and has only 256 MB RAM.

Tom