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Some special environment variables are used by Transbuild. Other standard environment variables (e.g. those for the timezone and locale) are also used, but are not described here.
The SGML_CATALOG_FILES environment variable specifies a colon
separated list of catalog files. These are Open SGML entity catalog
files which describe the mapping from external references in DTDs to
local files. One use is to allows the XML validation to be performed
using local copies of the DTDs rather than using the ones specified in
the system ID.
An example is shown below. Here it is mapping public
identifiers into local files. When these identifiers are encountered
in DOCTYPE declarations, these local files are used.
PUBLIC "-//W3C//DTD XMLSCHEMA 200102//EN" "/usr/local/w3c/xsd.dtd" PUBLIC "-//W3C//DTD SVG 1.0//EN" "/usr/local/w3c/svg10.dtd" PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "/usr/local/w3c/xhtml1-s.dtd"
The TMPDIR environment variable specifies the
directory in which temporary files are created. If not specified,
/tmp is used.