one 'head' node, rather than just pointyhat itself.
Constants are factored out into installation-specific files known as
portbuild/conf/server.conf and portbuild/conf/client.conf. There is
only one server.conf file. Individual <arch> directories may have
their own client.conf files, or may symlink to ../conf/client.conf.
Gracefully handle the case of INDEX failing to build. This helps the
calling script to exit instead of spewing errors.
Feature safe: yes
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