[tlbuild] libiconv issue

[Nelson H. F. Beebe]

Dick Koch writes:

>> Just for the record, I rename /usr/local before making
>> TeX Live builds for Mac OS X to avoid this sort of problem.

We do that do on Gentoo Linux boxes, where all packages are built
from source.  However, it is impractical to do that on most of our
machines, because /usr/local contains login shells and much else,
and we have a large user base.

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