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doc: Cross-reference virtual build machines from ‘guix time-machine’. 

* doc/guix.texi (Invoking guix time-machine): Tweak the note about
packages that may fail to build.  Add cross-reference to virtual build
machines.

Change-Id: Ib2a4a28cdca0c8970d0f5327e39b4a21800ea2e1
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Ludovic Courtès 2024-03-29 22:40:52 +01:00
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@ -5029,10 +5029,10 @@ Although it should technically be possible to travel to such an old
commit, the ease to do so will largely depend on the availability of commit, the ease to do so will largely depend on the availability of
binary substitutes. When traveling to a distant past, some packages may binary substitutes. When traveling to a distant past, some packages may
not easily build from source anymore. One such example are old versions not easily build from source anymore. One such example are old versions
of Python 2 which had time bombs in its test suite, in the form of of OpenSSL whose tests would fail after a certain date. This particular
expiring SSL certificates. This particular problem can be worked around problem can be worked around by running a @dfn{virtual build machine}
by setting the hardware clock to a value in the past before attempting with its clock set to the right time (@pxref{build-vm, Virtual Build
the build. Machines}).
@end quotation @end quotation
The general syntax is: The general syntax is: