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-rw-r--r--gnu/packages/haskell.scm13
1 files changed, 13 insertions, 0 deletions
diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 9825dba5e1..dcd21e2a46 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -6783,6 +6783,19 @@ which automatically lift operations introduced by monad transformers through
other transformers.")
(license license:bsd-3)))
+;; darcs-2.12.0 requires transformers-0.4.2.0
+(define-public ghc-transformers-0.4.2.0
+ (package
+ (inherit ghc-transformers)
+ (version "0.4.2.0")
+ (source (origin
+ (method url-fetch)
+ (uri (string-append "https://hackage.haskell.org/package/transformers/"
+ "transformers-" version ".tar.gz"))
+ (sha256
+ (base32
+ "0a364zfcm17mhpy0c4ms2j88sys4yvgd6071qsgk93la2wjm8mkr"))))))
+
(define-public ghc-findbin
(package
(name "ghc-findbin")