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5.3.1 Official Substitute Servers and are both front-ends to official build farms that build packages from Guix continuously for some architectures, and make them available as substitutes. These are the default source of substitutes; which can be overridden by passing the --substitute-urls option either to guix-daemon (veja guix-daemon --substitute-urls) or to client tools such as guix package (veja client --substitute-urls option).

Substitute URLs can be either HTTP or HTTPS. HTTPS is recommended because communications are encrypted; conversely, using HTTP makes all communications visible to an eavesdropper, who could use the information gathered to determine, for instance, whether your system has unpatched security vulnerabilities.

Substitutes from the official build farms are enabled by default when using Guix System (veja Distribuição GNU). However, they are disabled by default when using Guix on a foreign distribution, unless you have explicitly enabled them via one of the recommended installation steps (veja Instalação). The following paragraphs describe how to enable or disable substitutes for the official build farm; the same procedure can also be used to enable substitutes for any other substitute server.