Runtime Support - Novell LINUX ENTERPRISE SERVER 10 SP2 - INSTALLATION AND ADMINISTRATION Installation Manual

19.1 Runtime Support

IMPORTANT: Conflicts between Application Versions
If an application is available both for 32-bit and 64-bit environments, parallel
installation of both versions is bound to lead to problems. In such cases, decide
on one of the two versions and install and use this.
To be executed correctly, every application requires a range of libraries. Unfortunately,
the names for the 32-bit and 64-bit versions of these libraries are identical. They must
be differentiated from each other in another way.
The same approach is used for the 64-bit platforms ppc64, s390x, and x86_64: To retain
compatibility with the 32-bit version, the libraries are stored at the same place in the
system as in the 32-bit environment. The 32-bit version of libc.so.6 is located under
/lib/libc.so.6 in both the 32-bit and 64-bit environments.
All 64-bit libraries and object files are located in directories called lib64. The 64-bit
object files you would normally expect to find under /lib, /usr/lib, and /usr/
X11R6/lib are now found under /lib64, /usr/lib64, and /usr/X11R6/
lib64. This means that there is space for the 32-bit libraries under /lib, /usr/lib
and /usr/X11R6/lib, so the filename for both versions can remain unchanged.
Subdirectories of 32-bit /lib directories whose data content does not depend on the
word size are not moved. For example, the X11 fonts are still found in the usual location
under /usr/X11R6/lib/X11/fonts. This scheme conforms to LSB (Linux
Standards Base) and FHS (File System Hierarchy Standard).
►ipf: The 64-bit libraries for ia64 are located in the standard lib directories. In such
cases, there is neither a lib64 directory or a lib32 directory. ia64 executes the 32-
bit x86 code under an emulation. A set of basic libraries is installed in /emul/
ia32-linux/lib and /emul/ia32-linux/usr/X11R6/lib. ◄
384 Installation and Administration