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Libraries upgrading policy (Was: Bug#9826)


My problem I have submited as lprng bug (9826) in May 97. I have reply from
lprng maintainer:
> I have never experienced this problem. Please discuss this at
> debian-devel.

Maybe it's more general. This bug I have experienced twice: in May and now.
After I upgraded lib's (all was Ok with ldconfig) -  I've got in /var/log/lp-errs:

  /usr/bin/gs: can't load library 'libXt.so.6'
  /usr/sbin/ljet4-filter: /usr/bin/gs  -q -dSAFER -dNOPAUSE -r600 -sDEVICE=ljet4 -sOutputFile=- -  failed

gs works from terminal without problems.
I changed real filter for lpd to my script:

  #! /bin/bash

and in /tmp/filter.test.out are:


They are defaults in /usr/sbin/lpd and I don't see path for /usr/X11R6/lib.
OK lpd don't need it:

  19:55:11 3:mirek@dionizos~$ ldd lpd        
         libncurses.so.3.0 =>/lib/libncurses.so.3.0
        libc.so.5 => /lib/libc.so.5

But gs as filter don't work. I run ldconfig twice and more :(
I have /usr/X11R6/lib in /etc/ld.so.conf and run ldconfig without
problems. Probably lpd runs its childs whith old ld.so.cache?

I have 3 solutions for this problem
1) down and up lpd demon
2) Set LD_LIBRARY_PATH in /etc/lpd.conf
3) Set LD_LIBRARY_PATH in filter script

I don't see any of those solusion are good for future system upgrades.

I have questions:
1) lprng isn't full debianized?
2) How to find those not explicite dependiences in packages?
3) Should I do down&up all daemons after libraries upgrade?

Any comments?

Mirek Kwasniak

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