||You should always have a rescue disk set ready
when you perform this procedure, in the likely event that something
This procedure is especially difficult if you're upgrading
very old libraries like libc4.
But you should be able to keep libc4
on the same system with libc5
libraries for the programs that still need them. The same holds
true for upgrading from libc5
to the newer-yet glibc2 libraries.
The problem with upgrading dynamic libraries is that the moment
you remove the old libraries, the utilities that you need to
upgrade to the new version of the libraries don't work. There
are ways around around this. One is to temporarily place a spare
copy of the run time libraries, which are in /lib/,
in /usr/lib/, or /usr/local/lib/, or another
directory that is listed in the /etc/ld.so.conf file.
For example, when upgrading libc5
libraries, the files in /lib/ might look something like:
libc.so.5 libc.so.5.4.33 libm.so.5 libm.so.5.0.9
These are the C libraries and the math libraries. Copy them
to another directory that is listed in /etc/ld.so.conf,
$ cp -df /lib/libc.so.5* /usr/lib/
$ cp -df /lib/libm.so.5* /usr/lib/
Be sure to run ldconfig to upgrade the library configuration.
The files libc.so.5 and libm.so.5 are symbolic
links to the actual library files. When you upgrade, the new
links will not be created if the old links are still there, unless
you use the -f flag with cp. The -d flag
to cp will copy the symbolic link itself, and not the
file it points to.
If you need to overwrite the link to the library directly,
use the -f flag with ln.
For example, to copy new libraries over the old ones, try
this. Make a symbolic link to the new libraries first, then copy
both the libraries and the links to /lib/, with the
$ ln -sf ./libm.so.5.0.48 libm.so.5
$ ln -sf ./libc.so.5.0.48 libc.so.5
$ cp -df libm.so.5* /lib
$ cp -df libc.so.5* /lib
Again, remember to run ldconfig after you copy the
If you are satisfied that everything is working correctly,
you can remove the temporary copies of the old libraries from
/usr/lib/ or wherever you copied them.