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system property that describes which architecture the package is built on
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In Nix, the term system specificity expresses the fact that all Nix derivations have a system attribute that specifies which system the derivation is built on.
In order to realize a Nix derivation into a package, each derivation in the package's closure needs to be supported on the target system.
So if you want to build the package foo on an x86_64-linux system, any dependency of the foo derivation needs to be supported on x86_64-linux.
System specificity is essential to Nix being a truly multi-platform system. Because all derivations—and thus all packages—are system specific, things like Nix development environments and NixOS configurations are also system specific.