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20.3 Environment Variables Recognized by texi2any

makeinfo also reads the environment variable TEXINFO_OUTPUT_FORMAT to determine the output format, if not overridden by a command line option. The value should be one of:

docbook  dvi  dvipdf  html  info  pdf  plaintext  ps  xml

If not set or otherwise specified, Info output is the default.

The customization variable of the same name is also read; if set, that overrides an environment variable setting, but not a command-line option. See Customization Variables and Options.

You can control texi2any’s use of Perl extension modules by setting the TEXINFO_XS environment variable. These modules are compiled native code that the interpreted Perl code can use. Ideally, these extension modules should just work, and the only noticable difference they should make is that texi2any finishes running sooner. However, you can use this environment variable for the purposes of troubleshooting: for example, if you have problems with the output of texi2any varying depending on whether the extension modules are in use.

The following values of TEXINFO_XS are recognized by texi2any:

default

The default behavior. Try to load extension modules, and silently fall back to the interpreted Perl implementations if this fails.

warn

Try to load extension modules, and if this fails, give a warning message before falling back to the interpreted Perl implementations.

debug

Try to load extension modules, printing many messages while doing so.

omit

Do not use extension modules.


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