Guix manifest for Rust development with C FFI

manifest.scm

(use-modules (gnu packages llvm)
             (guix search-paths)
             (gnu packages build-tools)
             (gnu packages rust))

(define %clang-with-env
(manifest 
 (list 
  (manifest-entry
   (name "clang-with-env")
   (version "21")
   (item clang-toolchain-21)
   (search-paths (list
                  (search-path-specification
                   (variable "LIBCLANG_PATH")
                   (files (list "lib")))))))))

(concatenate-manifests (list 
                        %clang-with-env
                        (specifications->manifest
                                          '(
                                           "rust"
                                           "rust:cargo"
                                           "rust:rust-src"))))