When trying to build tools that rely on rustc crates using the rust.download-rustc=true and llvm.download-ci-llvm=false options, ld can not find the LLVM it needs.

$ x build miri
...
...
...
  = note: /usr/bin/ld: cannot find -lLLVM-18-rust-1.79.0-nightly: No such file or directory
          collect2: error: ld returned 1 exit status


error: could not compile `rustdoc-tool` (bin "rustdoc_tool_binary") due to 1 previous error
Build completed unsuccessfully in 0:01:02

I have also attempted to build rustdoc and clippy and they too failed due to the same issue. So I am quite sure this happens on any tool that uses rustc crates.