Convert Rust crates to RPM.
.rust2rpm.conf
You can place configuration file which is used as source for additional information for spec generation.
Some simple example would be better than many words ;)
[DEFAULT] unwanted-features = compiler_builtins rustc-dep-of-std buildrequires = pkgconfig(foo) >= 1.2.3 lib.requires = pkgconfig(foo) >= 1.2.3 [fedora] bin.requires = findutils buildrequires = lib.requires = lib+default.requires = pkgconfig(bar) >= 2.0.0