From owner-freebsd-ports@FreeBSD.ORG  Mon Apr 30 06:45:37 2007
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Date: Mon, 30 Apr 2007 08:45:17 +0200
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Subject: install fails because / is not writeable
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Once in a while a port fails to upgrade, because it wants to write something in /etc. E.g. perl into /etc/make.conf or other ports into /etc/group.

On my systems / is normally a read only mount. These ports build fine during a portupgrade and fail during install, leaving most of the port installed, but unregistered (i.e. the package database is broken).

I think such ports should set something like USE_WRITE_SLASH=yes and refuse to install if / is not writeable.