Package constaints.

Author: cchalmers

diagrams-lib.cabal

@@ -123,8 +123,8 @@ Library
                        system-filepath >= 0.2 && < 0.5,
                        text >= 0.7.1 && < 1.3,
                        mtl >= 2.0 && < 2.3,
-                       transformers,
-                       exceptions
+                       transformers >= 3.0 && < 5.0,
+                       exceptions >= 0.6 && < 1.0
   if impl(ghc < 7.6)
     Build-depends: ghc-prim
   Hs-source-dirs:      src