libc5 on freebsd 6.3

Lowell Gilbert freebsd-questions-local at
Tue Feb 19 17:54:54 UTC 2008

lenny at writes:

> Thank you for your response, but it doesn't really help with the situation,
> besides the software I'm talking about has been recompiled many time over
> since the upgrade.  Just to make sure, I recompiled again and it linked to
> both libc5 and libc6 right away. That's my issue.

Yes, but did you recompile all of the ports libraries that the
application links to?  Any of *them* could be the problem too.

>> lenny at wrote:
>>> after several years of relatively trouble free system ( 5 > 6.3 ) and
>>> port
>>> upgrades, I started having some issues with timesieved daemon of cyrus
>>> imap.
>>> nothing in the software configuration has changed, but the cyrus port
>>> was
>>> recently upgraded ( around the same time that the system was upgraded
>>> from
>>> 6.2 to 6.3 )
>>> the only thing that looks suspicious is the fact that most ( or all )
>>> cyrus binaries are linked to both libc5 and libc6.  in fact, after some
>>> digging around, I discovered that many other binaries on the system seem
>>> be linked to both libraries. I suspect that libc5 is the remnant of 5x
>>> installation.
>>>  What's the safest thing to do ?
>>>  remove libc5 and link libc5 to libc6  ?
>>> rebuild affected software ? ( couldn't find a relevant make.conf option,
>>> so what might a flag like that look like ? WITH_LIBC_VER=6   ?
>> You have to recompile all your installed ports as part of your upgrade
>> to a new version of FreeBSD (e.g. 5.x -> 6.x, 6.x -> 7.x, etc).  The
>> only reason this is necessary is to prevent this kind of problem from
>> creeping in as you incrementally rebuild your ports over time.  Binaries
>> linked to incompatible or inconsistent sets of libraries like two
>> different versions of libc will behave unpredictably and may crash.  No
>> special care needs to be taken when recompiling, just make sure to
>> recompile everything (portupgrade -fa or -faPP or similar).
>> Kris
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Lowell Gilbert, embedded/networking software engineer, Boston area

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