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rust-srpm-macros is a dependency of redhat-rpm-config so that Rust-based SRPMs can rely on these particular macros. In RHEL 9 and earlier, rust-srpm-macros was a separate source package which was included in RHEL. Since then, it became a subpackage of rust-packaging in Fedora. In order to not pull in any part of rust-packaging into RHEL 10, thereby allowing it to be maintained separately in EPEL, those macros are provided here instead.