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Packages should build reproducibly, which for the purposes of this document 19 means that given
a version of a source package unpacked at a given path;
a set of versions of installed build dependencies;
a set of environment variable values;
a build architecture; and
a host architecture,
repeatedly building the source package for the build architecture on any machine of the host architecture with those versions of the build dependencies installed and exactly those environment variable values set will produce bit-for-bit identical binary packages.
It is recommended that packages produce bit-for-bit identical binaries even if most environment variables and build paths are varied. It is intended for this stricter standard to replace the above when it is easier for packages to meet it.
