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6.3.1. Upgrade Issues
A Package Manager makes it easy to upgrade to newer versions when they are released. Generally the instructions in the LFS and BLFS Book can be used to upgrade to the newer versions. Here are some points that you should be aware of when upgrading packages, especially on a running system.
• If Glibc needs to be upgraded to a newer version, (e.g. from glibc-2.19 to glibc-2.20), it is safer to rebuild LFS. Though you may be able to rebuild all the packages in their dependency order, we do not recommend it.
• If a package containing a shared library is updated, and if the name of the library changes, then all the packages dynamically linked to the library need to be recompiled to link against the newer library. (Note that there is no correlation between the package version and the name of the library.) For example, consider a package foo-1.2.3 that installs a shared library with name libfoo.so.1. Say you upgrade the package to a newer version foo-1.2.4 that installs a shared library with name libfoo.so.2. In this case, all packages that are dynamically linked
to libfoo.so.1 need to be recompiled to link against libfoo.so.2. Note that you should not remove the previous libraries until the dependent packages are recompiled.