gnu: ocaml-frontc: Update to 4.1.0.

* gnu/packages/ocaml.scm (ocaml-frontc): Update to 4.1.0.
(ocaml4.07-frontc): New variable.

gnu/packages/ocaml.scm

@@ -1478,14 +1478,49 @@ for speed and space economy.")
 (define-public ocaml-frontc
   (package
     (name "ocaml-frontc")
-    (version "3.4.2")
+    (version "4.1.0")
     (source (origin
               (method git-fetch)
               (uri (git-reference
                      (url "https://github.com/BinaryAnalysisPlatform/FrontC")
+                     (commit (string-append "v" version))))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "1mi1vh4qgscnb470qwidccaqd068j1bqlz6pf6wddk21paliwnqb"))))
+    (build-system dune-build-system)
+    (arguments
+     `(#:test-target "test.t"
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'make-writable
+           (lambda _
+             (for-each make-file-writable (find-files "." ".")))))))
+    (native-inputs
+     `(("ocaml-menhir" ,ocaml-menhir)
+       ("ocaml-odoc" ,ocaml-odoc)))
+    (properties `((upstream-name . "FrontC")
+                  (ocaml4.07-variant . ,(delay ocaml4.07-frontc))))
+    (home-page "https://www.irit.fr/FrontC")
+    (synopsis "C parser and lexer library")
+    (description "FrontC is an OCAML library providing a C parser and lexer.
+The result is a syntactic tree easy to process with usual OCAML tree management.
+It provides support for ANSI C syntax, old-C K&R style syntax and the standard
+GNU CC attributes.  It provides also a C pretty printer as an example of use.")
+    (license license:lgpl2.1)))
+
+(define-public ocaml4.07-frontc
+  (package-with-ocaml4.07
+    (package
+      (inherit ocaml-frontc)
+      (version "3.4.2")
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                       (url "https://github.com/mirage/ocaml-base64")
                        (commit (string-append
                                  "V_" (string-join (string-split version #\.) "_")))))
-              (file-name (git-file-name name version))
+                (file-name (git-file-name "ocaml-frontc" version))
                 (sha256
                  (base32
                   "0k7jk9hkglnkk27s62xl493jyqc017gyvwqb1lyc0ywbb001s102"))))
@@ -1512,14 +1547,7 @@ archive(native) = \"frontc.cmxa\""))))
          #:make-flags (list (string-append "PREFIX="
                                            (assoc-ref %outputs "out"))
                             "OCAML_SITE=$(LIB_DIR)/ocaml/")))
-    (properties `((upstream-name . "FrontC")))
-    (home-page "https://www.irit.fr/FrontC")
-    (synopsis "C parser and lexer library")
-    (description "FrontC is an OCAML library providing a C parser and lexer.
-The result is a syntactic tree easy to process with usual OCAML tree management.
-It provides support for ANSI C syntax, old-C K&R style syntax and the standard
-GNU CC attributes.  It provides also a C pretty printer as an example of use.")
-    (license license:lgpl2.1)))
+      (properties '()))))
 
 (define-public ocaml-qcheck
   (package