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To install the library and its header files, and the Info files of the
manual, type make install. This will
build things, if necessary, before installing them; however, you should
still compile everything first. If you are installing the GNU C Library as your
primary C library, we recommend that you shut the system down to
single-user mode first, and reboot afterward. This minimizes the risk
of breaking things when the library changes out from underneath.
‘make install’ will do the entire job of upgrading from a previous installation of the GNU C Library version 2.x. There may sometimes be headers left behind from the previous installation, but those are generally harmless. If you want to avoid leaving headers behind you can do things in the following order.
You must first build the library (‘make’), optionally check it (‘make check’), switch the include directories and then install (‘make install’). The steps must be done in this order. Not moving the directory before install will result in an unusable mixture of header files from both libraries, but configuring, building, and checking the library requires the ability to compile and run programs against the old library. The new /usr/include, after switching the include directories and before installing the library should contain the Linux headers, but nothing else. If you do this, you will need to restore any headers from libraries other than the GNU C Library yourself after installing the library.
You can install the GNU C Library somewhere other than where you configured
it to go by setting the DESTDIR GNU standard make variable on
the command line for ‘make install’. The value of this variable
is prepended to all the paths for installation. This is useful when
setting up a chroot environment or preparing a binary distribution.
The directory should be specified with an absolute file name. Installing
with the prefix and exec_prefix GNU standard make variables
set is not supported.
The GNU C Library includes a daemon called nscd, which you
may or may not want to run. nscd caches name service lookups; it
can dramatically improve performance with NIS+, and may help with DNS as
well.
One auxiliary program, /usr/libexec/pt_chown, is installed setuid
root if the ‘--enable-pt_chown’ configuration option is used.
This program is invoked by the grantpt function; it sets the
permissions on a pseudoterminal so it can be used by the calling process.
If you are using a Linux kernel with the devpts filesystem enabled
and mounted at /dev/pts, you don’t need this program.
After installation you might want to configure the timezone and locale
installation of your system. The GNU C Library comes with a locale
database which gets configured with localedef. For example, to
set up a German locale with name de_DE, simply issue the command
‘localedef -i de_DE -f ISO-8859-1 de_DE’. To configure all locales
that are supported by the GNU C Library, you can issue from your build directory the
command ‘make localedata/install-locales’.
To configure the locally used timezone, set the TZ environment
variable. The script tzselect helps you to select the right value.
As an example, for Germany, tzselect would tell you to use
‘TZ='Europe/Berlin'’. For a system wide installation (the given
paths are for an installation with ‘--prefix=/usr’), link the
timezone file which is in /usr/share/zoneinfo to the file
/etc/localtime. For Germany, you might execute ‘ln -s
/usr/share/zoneinfo/Europe/Berlin /etc/localtime’.