gnu: Add sbcl-fare-quasiquote.

* gnu/packages/lisp.scm (sbcl-fare-quasiquote): New variable.

gnu/packages/lisp.scm

@@ -6255,3 +6255,40 @@ (define-public sbcl-optima
       (description "Optima is a fast pattern matching library which uses
 optimizing techniques widely used in the functional programming world.")
       (license license:expat))))
+
+(define-public sbcl-fare-quasiquote
+  (package
+    (name "sbcl-fare-quasiquote")
+    (build-system asdf-build-system/sbcl)
+    (version "20171130")
+    (home-page "http://common-lisp.net/project/fare-quasiquote")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "http://beta.quicklisp.org/archive/fare-quasiquote/"
+                           (date->string (string->date version "~Y~m~d") "~Y-~m-~d")
+                           "/fare-quasiquote-"
+                           version
+                           "-git.tgz"))
+       (sha256
+        (base32
+         "00brmh7ndsi0c97nibi8cy10j3l4gmkyrfrr5jr5lzkfb7ngyfqa"))))
+    (inputs
+     `(("fare-utils" ,sbcl-fare-utils)))
+    (arguments
+     ;; XXX: Circular dependencies: Tests depend on subsystems, which depend on the main systems.
+     `(#:tests? #f
+       #:phases
+       (modify-phases %standard-phases
+         ;; XXX: Require 1.0.0 version of fare-utils, and we package some
+         ;; commits after 1.0.0.5, but ASDF fails to read the
+         ;; "-REVISION-COMMIT" part generated by Guix.
+         (add-after 'unpack 'patch-requirement
+           (lambda _
+             (substitute* "fare-quasiquote.asd"
+               (("\\(:version \"fare-utils\" \"1.0.0\"\\)") "\"fare-utils\"")))))))
+    (synopsis "Pattern-matching friendly implementation of quasiquote for Common Lisp")
+    (description "The main purpose of this n+2nd reimplementation of
+quasiquote is enable matching of quasiquoted patterns, using Optima or
+Trivia.")
+    (license license:expat)))