gnu: Add ghc-aeson-for-pandoc-1.

* gnu/packages/haskell-web.scm (ghc-aeson-for-pandoc-1): New variable.

gnu/packages/haskell-web.scm

@@ -777,6 +777,18 @@ for Haskell, optimized for ease of use and high performance.  (A note on
 naming: in Greek mythology, Aeson was the father of Jason.)")
     (license license:bsd-3)))
 
+(define-public ghc-aeson-for-pandoc-1
+  (package (inherit ghc-aeson)
+    (version "1.1.2.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://hackage.haskell.org/package/aeson/aeson-"
+                           version ".tar.gz"))
+       (sha256
+        (base32
+         "1zy5z8pzvh53qkjm0nm3f4rwqfqg3867ck8ncd6mrxpcyvxqqj1p"))))))
+
 (define-public ghc-aeson-pretty
   (package
     (name "ghc-aeson-pretty")