This patch tries to estimate average build times when
the user runs a "emerge --pretend".
Estimates are calculated by looking at previous builds
in emerge.log. For instance, if a user has built
mozilla 1.3 and 1.4 in the past, and now decides to
upgrade to 1.5. By doing a "emerge --pretend" he will
be able to see the packages that need to be upgrade
with it, and if all of the packages have been installed
before, he gets a messages after "--pretend" is
finished telling him what the average build time for
those packages is, on his particular system.
If porthole cannot estimate a build time for every
single package that needs to be emerged, it will
display a message telling the user that it can't
calculate accurate estimates.
Here are some example screenshots:
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