[PATCH 1/2] gnu: Add ghc-transformers

[James David Trotter]

* gnu/packages/haskell.scm (ghc-transformers): New variable.
---
 gnu/packages/haskell.scm | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 34cad87..33d58f4 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -458,6 +458,30 @@ Haskell software by automating the fetching, 
configuration, compilation and
 installation of Haskell libraries and programs.")
    (license bsd-3)))
 
+(define-public ghc-transformers
+  (package
+    (name "ghc-transformers")
+    (version "0.4.3.0")
+    (outputs '("out" "doc"))
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "http://hackage.haskell.org/package/transformers/transformers-";
+             version
+             ".tar.gz"))
+       (sha256
+        (base32 "179sbhvc9dghyw58hz80109pbrzgh7vh437227a51jhmx2bsgl5k"))))
+    (build-system haskell-build-system)
+    (home-page "http://hub.darcs.net/ross/transformers";)
+    (synopsis "Concrete functor and monad transformers")
+    (description
+     "A portable library of functor and monad transformers, inspired by the
+paper \"Functional Programming with Overloading and Higher-Order
+Polymorphism\", by Mark P Jones, in Advanced School of Functional Programming,
+1995 (http://web.cecs.pdx.edu/~mpj/pubs/springschool.html).")
+    (license bsd-3)))
+
 (define-public ghc-mtl
   (package
     (name "ghc-mtl")
-- 
2.4.3