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Variable Names [substvars-name]
===============================
Variable names may only consist of uppercase and lowercase Latin letters,
digits, and hyphens. Names must be at least one character long. (A regular
expression for this is `[A-Za-z0-9-]+`.)
Variable Substitutions [substvars-exp]
======================================
Variable substitutions are performed on certain source and binary control field
values, as explained in $[sectlink][fields].
The format for variable substitutions is as follows:
${<var-name>}
`<var-name>` is the name of the variable.
Special Variables [substvars-defined]
=====================================
The following substitution variables shall be set:
* `Source-Version`
The source package version, as given in the most recent entry of the change
log. See $[sectlink][src-ver] for the syntax of source package version
identifiers.
* `Binary-Version`
The binary package version, as given in the most recent entry of the change
log. See $[sectlink][src-ver] for the syntax of source package version
identifiers.
* `Host-Arch`
The distribution architecture string of the host system.
* `Host-Plat`
The application platform of the host system.
Defining Substitution Variables [substvars-custom]
==================================================
Substitution variables may be defined in a file called `substvars`. See
$[sectlink][control] for the format of this file.
Names must conform to the requirements outlined in $[sectlink][substvars-name].
Values may be comprised of multiple lines, and empty lines at the beginning and
end of each substitution variable value shall be removed.
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