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TeX needs to know where to find the `texinfo.tex' file that you have told it to input with the `\input texinfo' command at the beginning of the first line. The `texinfo.tex' file tells TeX how to handle @-commands; it is included in all standard GNU distributions.
Usually, the `texinfo.tex' file is put under the default directory that contains TeX macros (`/usr/local/share/texmf/tex/texinfo/texinfo.tex' by default) when GNU Emacs or other GNU software is installed. In this case, TeX will find the file and you do not need to do anything special. Alternatively, you can put `texinfo.tex' in the current directory when you run TeX, and TeX will find it there.
Also, you should install `epsf.tex' in the same place as
`texinfo.tex', if it is not already installed from another
distribution. This file is needed to support the @image command
(see section Inserting Images).
Optionally, you may create an additional `texinfo.cnf', and install
it as well. This file is read by TeX when the @setfilename
command is executed (see section @setfilename). You can put any
commands you like there, according to local site-wide conventions. They
will be read by TeX when processing any Texinfo document. For
example, if `texinfo.cnf' contains the line `@afourpaper'
(see section Printing on A4 Paper), then all Texinfo documents will be processed with
that page size in effect. If you have nothing to put in
`texinfo.cnf', you do not need to create it.
If neither of the above locations for these system files suffice for
you, you can specify the directories explicitly. For
`texinfo.tex', you can do this by writing the complete path for the
file after the \input command. Another way, that works for both
`texinfo.tex' and `texinfo.cnf' (and any other file TeX
might read), is to set the TEXINPUTS environment variable in your
`.cshrc' or `.profile' file.
Which you use of `.cshrc' or `.profile' depends on
whether you use a Bourne shell-compatible (sh, bash,
ksh, ...) or C shell-compatible (csh, tcsh)
command interpreter. The latter read the `.cshrc' file for
initialization information, and the former read `.profile'.
In a `.cshrc' file, you could use the following csh command
sequence:
setenv TEXINPUTS .:/home/me/mylib:/usr/lib/tex/macros
In a `.profile' file, you could use the following sh command
sequence:
TEXINPUTS=.:/home/me/mylib:/usr/lib/tex/macros export TEXINPUTS
On MS-DOS/MS-Windows, you would say it like this(10):
set TEXINPUTS=.;d:/home/me/mylib;c:/usr/lib/tex/macros
It is customary for DOS/Windows users to put such commands in the `autoexec.bat' file, or in the Windows Registry.
These settings would cause TeX to look for `\input' file first in the current directory, indicated by the `.', then in a hypothetical user's `me/mylib' directory, and finally in a system directory `/usr/lib/tex/macros'.
Finally, you may wish to dump a `.fmt' file (see section `Memory dumps' in Web2c) so that TeX can load Texinfo faster. (The disadvantage is that then updating `texinfo.tex' requires redumping.) You can do this by running this command, assuming `epsf.tex' is findable by TeX:
initex texinfo @dump
(@dump is a TeX primitive.) You'll then need to move
`texinfo.fmt' to wherever your .fmt files are found;
typically this will be in the subdirectory `web2c' of your TeX
installation, for example, `/usr/local/share/tex/web2c'.
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