portmaster failing with build dependencies recognition

[Alberto Villa]

hi doug and ports@

i'm installing a system from scratch in a jail with portmaster 2.21, with the 
build/packages options enabled:

`--> cat /usr/local/etc/portmaster.rc
ALWAYS_SCRUB_DISTFILES=dopt
LOCAL_PACKAGEDIR=/usr/ports/packages
MAKE_PACKAGE=gopt
PM_DEL_BUILD_ONLY=pm_dbo
PM_INDEX=pm_index
PM_PACKAGES_BUILD=pmp_build

while having only six ports installed (ccache, zsh, portmaster, pkg_cutleaves, 
subversion-freebsd and sudo), the command `sudo portmaster 
www/nspluginwrapper www/linux-f10-flashplugin` installed ALL the 
dependencies (with the exception of pkg-config) from a package, and removed 
them at the end (with pkg_delete obviously complaining about them being 
required packages)
commenting PM_DEL_BUILD_ONLY and PM_PACKAGES_BUILD completely fixed 
the issue, so there must be something wrong with the recognition of build 
dependencies. i remember that you did something to that algorithm some 
time ago (logs say that), and i'm sure that it was working correctly before...

btw, thanks for the work you're doing on this tool, it's greater at every 
release :)
-- 
Alberto Villa, FreeBSD committer <avilla at FreeBSD.org>
http://people.FreeBSD.org/~avilla

It is your concern when your neighbor's wall is on fire.
		-- Quintus Horatius Flaccus (Horace)
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