Defaults to the value of Acquire::PDiffs which is true by default.
Can be overridden per-source by the sources.list option of the same
name. See the documentation for both of these for details.
+* By-Hash: controls if apt will try to use an URI constructed from
+ a hashsum of the file to download. See the documentation for config
+ option Acquire::By-Hash and sources.list option By-Hash for details.
* CompressionTypes: The default value is a space separated list of
compression types supported by apt (see Acquire::CompressionTypes).
You can set this option to prevent apt from downloading a compression
APT::Architectures (potentially modified by sources.list options),
e.g. "amd64", "i386" or "armel" for the 'deb' type. In type 'deb-src'
this variable has the value "source".
+* $(NATIVE_ARCHITECTURE): The architecture apt treats as the native
+ architecture for this system configured as APT::Architecture
+ defaulting to the architecture apt itself was built for.
Note that while more variables might exist in the implementation, these
are to be considered undefined and their usage strongly discouraged. If