gnu: emacs-wgrep: Update to 20180711.

* gnu/packages/emacs.scm (emacs-wgrep): Update to 20180711.

gnu/packages/emacs.scm

@@ -4576,25 +4576,28 @@ Dust.js, React/JSX, Angularjs, ejs, etc.")
     (license license:gpl3+)))
 
 (define-public emacs-wgrep
-  (package
-    (name "emacs-wgrep")
-    (version "2.1.10")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append
-                    "https://github.com/mhayashi1120/Emacs-wgrep/archive/"
-                    version ".tar.gz"))
-              (file-name (string-append name "-" version ".tar.gz"))
-              (sha256
-               (base32
-                "1r2bpypar70xg6dsx12x1k74f39ww930rday7rgqpyknzsx1k4l1"))))
-    (build-system emacs-build-system)
-    (home-page "https://github.com/mhayashi1120/Emacs-wgrep")
-    (synopsis "Edit a grep buffer and apply those changes to the files")
-    (description
-     "Emacs wgrep allows you to edit a grep buffer and apply those changes to
-the file buffer.")
-    (license license:gpl3+)))
+  (let ((commit "414be70bd313e482cd9f0b70fd2daad4ee23497c"))
+    ;; Late commit fixes compatibility issue with Emacs 26+.
+    (package
+      (name "emacs-wgrep")
+      (version (git-version "2.1.10" "1" commit))
+      (source (origin
+                (method git-fetch)
+                (uri (git-reference
+                      (url "https://github.com/mhayashi1120/Emacs-wgrep")
+                      (commit commit)))
+                (file-name (git-file-name name version))
+                (sha256
+                 (base32
+                  "1sdhd587q3pg92lhiayph87azhalmf1gzrnsprkmqvnphv7mvks9"))))
+      (build-system emacs-build-system)
+      (home-page "https://github.com/mhayashi1120/Emacs-wgrep")
+      (synopsis "Edit a grep buffer and apply those changes to the files")
+      (description
+       "Emacs wgrep allows you to edit a grep buffer and apply those changes
+to the file buffer.  Several backends are supported beside the classic grep:
+ack, ag, helm and pt.")
+      (license license:gpl3+))))
 
 (define-public emacs-helm
   (package