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diff --git a/guix/build/cargo-build-system.scm b/guix/build/cargo-build-system.scm
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+++ b/guix/build/cargo-build-system.scm
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+;;; GNU Guix --- Functional package management for GNU
+;;; Copyright © 2016 David Craven <david@craven.ch>
+;;;
+;;; This file is part of GNU Guix.
+;;;
+;;; GNU Guix is free software; you can redistribute it and/or modify it
+;;; under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation; either version 3 of the License, or (at
+;;; your option) any later version.
+;;;
+;;; GNU Guix is distributed in the hope that it will be useful, but
+;;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
+
+(define-module (guix build cargo-build-system)
+  #:use-module ((guix build gnu-build-system) #:prefix gnu:)
+  #:use-module (guix build utils)
+  #:use-module (ice-9 ftw)
+  #:use-module (ice-9 format)
+  #:use-module (ice-9 match)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-26)
+  #:export (%standard-phases
+            cargo-build))
+
+;; Commentary:
+;;
+;; Builder-side code of the standard Rust package build procedure.
+;;
+;; Code:
+
+;; FIXME: Needs to be parsed from url not package name.
+(define (package-name->crate-name name)
+  "Return the crate name of NAME."
+  (match (string-split name #\-)
+    (("rust" rest ...)
+     (string-join rest "-"))
+    (_ #f)))
+
+(define* (configure #:key inputs #:allow-other-keys)
+  "Replace Cargo.toml [dependencies] section with guix inputs."
+  ;; Make sure Cargo.toml is writeable when the crate uses git-fetch.
+  (chmod "Cargo.toml" #o644)
+  (let ((port (open-file "Cargo.toml" "a" #:encoding "utf-8")))
+    (format port "~%[replace]~%")
+    (for-each
+     (match-lambda
+       ((name . path)
+        (let ((crate (package-name->crate-name name)))
+          (when (and crate path)
+            (match (string-split (basename path) #\-)
+              ((_ ... version)
+               (format port "\"~a:~a\" = { path = \"~a/share/rust-source\" }~%"
+                       crate version path)))))))
+     inputs)
+    (close-port port))
+  #t)
+
+(define* (build #:key (cargo-build-flags '("--release" "--frozen"))
+                #:allow-other-keys)
+  "Build a given Cargo package."
+  (if (file-exists? "Cargo.lock")
+      (zero? (apply system* `("cargo" "build" ,@cargo-build-flags)))
+      #t))
+
+(define* (check #:key tests? #:allow-other-keys)
+  "Run tests for a given Cargo package."
+  (if (and tests? (file-exists? "Cargo.lock"))
+      (zero? (system* "cargo" "test"))
+      #t))
+
+(define* (install #:key inputs outputs #:allow-other-keys)
+  "Install a given Cargo package."
+  (let* ((out (assoc-ref outputs "out"))
+         (src (assoc-ref inputs "source"))
+         (rsrc (string-append (assoc-ref outputs "src")
+                              "/share/rust-source")))
+    (mkdir-p rsrc)
+    ;; Rust doesn't have a stable ABI yet. Because of this
+    ;; Cargo doesn't have a search path for binaries yet.
+    ;; Until this changes we are working around this by
+    ;; distributing crates as source and replacing
+    ;; references in Cargo.toml with store paths.
+    (copy-recursively "src" (string-append rsrc "/src"))
+    (install-file "Cargo.toml" rsrc)
+    ;; When the package includes executables we install
+    ;; it using cargo install. This fails when the crate
+    ;; doesn't contain an executable.
+    (if (file-exists? "Cargo.lock")
+        (system* "cargo" "install" "--root" out)
+        (mkdir out))))
+
+(define %standard-phases
+  ;; 'configure' phase is not needed.
+  (modify-phases gnu:%standard-phases
+    (replace 'configure configure)
+    (replace 'build build)
+    (replace 'check check)
+    (replace 'install install)))
+
+(define* (cargo-build #:key inputs (phases %standard-phases)
+                      #:allow-other-keys #:rest args)
+  "Build the given Cargo package, applying all of PHASES in order."
+  (apply gnu:gnu-build #:inputs inputs #:phases phases args))
+
+;;; cargo-build-system.scm ends here