Architecture
If a program needs to specify an architecture specification string in some place, it should select one of
the strings provided by dpkg-architecture -L. The strings are in the format os-arch, though the OS part
is sometimes elided, as when the OS is Linux. A package may specify an architecture wildcard.
Architecture wildcards are in the format any (which matches every architecture), os-any, or any-cpu. For
more details, see Debian policy <http://www.debian.org/doc/debian-policy/ch-customized-programs.html#s-
arch-spec> Mandatory.Typestring.Multi-Arch
This field is used to indicate how this package should behave on a multi-arch installations. This field
should not be present in packages with the Architecture: all field. Optional.Typeenum.choice:'same','foreign','allowed'.
Here are some explanations on the possible values:
'allowed'
allows reverse-dependencies to indicate in their Depends field that they need a package from a
foreign architecture, but has no effect otherwise.
'foreign'
the package is not co-installable with itself, but should be allowed to satisfy the dependency of a
package of a different arch from itself.
'same'
the package is co-installable with itself, but it must not be used to satisfy the dependency of any
package of a different architecture from itself.
SectionOptional.Typeuniline.
Note: Section is computed with '$source' and with:
• $source => "- - source Section"
PriorityOptional.Typeenum.choice:'required','important','standard','optional','extra'.
Note: Priority is computed with '$source' and with:
• $source => "- - source Priority"
EssentialOptional.Typeboolean.Depends-declaresanabsolutedependency.
The Depends field should be used if the depended-on package is required for the depending package to
provide a significant amount of functionality. See also debian policy <https://www.debian.org/doc/debian-
policy/ch-relationships.html> Optional.Typelistofuniline.Recommends-declaresastrong,butnotabsolute,dependency.
This field should list packages that would be found together with this one in all but unusual
installations. See also debian policy <https://www.debian.org/doc/debian-policy/ch-relationships.html>
Optional.Typelistofuniline.Suggests-declarethatonepackagemaybemoreusefulwithoneormoreothers.
Using this field tells the packaging system and the user that the listed packages are related to this one
and can perhaps enhance its usefulness, but that installing this one without them is perfectly
reasonable. See also debian policy <https://www.debian.org/doc/debian-policy/ch-relationships.html>
Optional.Typelistofuniline.Enhances-declarethatapackagecanenhancethefunctionalityofanotherpackage
This field is similar to Suggests but works in the opposite direction. It is used to declare that a
package can enhance the functionality of another package. See also debian policy
<https://www.debian.org/doc/debian-policy/ch-relationships.html> Optional.Typelistofuniline.Pre-Depends
This field is like Depends, except that it also forces dpkg to complete installation of the packages
named before even starting the installation of the package which declares the pre-dependency. See also
debian policy <https://www.debian.org/doc/debian-policy/ch-relationships.html> Optional.Typelistofuniline.Breaks
When one binary package declares that it breaks another, dpkg will refuse to allow the package which
declares Breaks to be unpacked unless the broken package is deconfigured first, and it will refuse to
allow the broken package to be reconfigured. See also debian policy <https://www.debian.org/doc/debian-
policy/ch-relationships.html> Optional.Typelistofuniline.Conflicts
When one binary package declares a conflict with another using a Conflicts field, dpkg will refuse to
allow them to be unpacked on the system at the same time. This is a stronger restriction than Breaks,
which prevents the broken package from being configured while the breaking package is in the "Unpacked"
state but allows both packages to be unpacked at the same time. See also debian policy
<https://www.debian.org/doc/debian-policy/ch-relationships.html> Optional.Typelistofuniline.Provides
declare the functionality brought by this package. Be sure to read the chapter about virtual package in
debian policy <https://www.debian.org/doc/debian-policy/ch-relationships.html> before using this
parameter. Optional.Typelistofuniline.Replaces
declare that this package should overwrite files in certain other packages, or completely replace other
packages. Be sure to read the section 7.6 of debian policy <https://www.debian.org/doc/debian-policy/ch-
relationships.html> before using this parameter. Optional.Typelistofuniline.Built-Using-Additionalsourcepackagesusedtobuildthebinary
Some binary packages incorporate parts of other packages when built but do not have to depend on those
packages. Examples include linking with static libraries or incorporating source code from another
package during the build. In this case, the source packages of those other packages are a required part
of the complete source (the binary package is not reproducible without them).
A Built-Using field must list the corresponding source package for any such binary package incorporated
during the build, including an "exactly equal" ("=") version relation on the version that was used to
build that binary package.
A package using the source code from the gcc-4.6-source binary package built from the gcc-4.6 source
package would have this field in its control file:
Built-Using: gcc-4.6 (= 4.6.0-11)
A package including binaries from grub2 and loadlin would have this field in its control file:
Built-Using: grub2 (= 1.99-9), loadlin (= 1.6e-1) I< Optional. Type list of uniline. >
Package-Type-Thetypeofthepackage,ifnotaregularDebianone
If this field is present, the package is not a regular Debian package, but either a udeb generated for
the Debian installer or a tdeb containing translated debconf strings. Optional.Typeenum.choice:'tdeb','udeb'.
Note: Package-Type is migrated with '$xc' and with:
• $xc => "- XC-Package-Type"
XC-Package-Type-Thetypeofthepackage,ifnotaregularDebianone
If this field is present, the package is not a regular Debian package, but either a udeb generated for
the Debian installer or a tdeb containing translated debconf strings. DeprecatedOptional.Typeenum.choice:'tdeb','udeb'.SynopsisMandatory.Typeuniline.DescriptionMandatory.Typestring.HomepageOptional.Typeuniline.XB-Python-VersionDeprecatedOptional.Typeuniline.XB-Ruby-Versions
indicate the versions of the interpreter supported by the library. DeprecatedOptional.Typeuniline.Build-Profiles
Build-Profiles specifies the condition for which that binary package does or does not build.
This is expressed as a list of lists of (optionally negated) profile names, forming a conjunctive normal
form expression in the same syntax as in the Build-Depends field.
For instance:
Build-Profiles: <!cross> <!nocheck>
See <https://wiki.debian.org/BuildProfileSpec#The_Build-Profiles_field> for more details. Optional.Typeuniline.
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