From owner-freebsd-ports@FreeBSD.ORG  Mon May 14 23:13:36 2012
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Date: Mon, 14 May 2012 18:13:34 -0500
From: Bryan Drewery <bryan@shatow.net>
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Subject: BUILD_DEPENDS= RUN_DEPENDS=
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Hi,

I was trying to append to these in my /etc/make.conf and found that a
large (thousands) number of ports are using = instead of +=, thus
destroying any user-supplied depends.

The use case for wanting to do this is to force devel/ccache to be a
build dependency on all ports, for package building. Or to force in a
particular library along with LDFLAGS into particular ports. This is
achievable by modifying bsd.local.mk, but is not ideal.

This goes along with updating all CLFAGS/LDFLAGS to use += instead of =.

If there is no objection to this route, I will follow-up with a patch/PR
to update the ports and handbook.

Regards,
Bryan Drewery