1 files changed, 14 insertions, 6 deletions

diff --git a/bencoding.cabal b/bencoding.cabal
index c6fa2af..eddcd53 100644
--- a/bencoding.cabal
+++ b/bencoding.cabal
@@ -19,6 +19,10 @@ description:
 extra-source-files:    README.md
                      , ChangeLog
 
+flag builder
+  description: Use older bytestring package and bytestring-builder.
+  default: False
+
 source-repository head
   type:                git
   location:            git://github.com/cobit/bencoding.git
@@ -41,15 +45,16 @@ library
   build-depends:       base       == 4.*
                      , ghc-prim
                      , integer-gmp
-                     , deepseq    == 1.3.*
-
+                     , deepseq    >= 1.3
                      , mtl
-
                      , attoparsec >= 0.10
-                     , bytestring >= 0.10
                      , text       >= 0.11
                      , pretty
   ghc-options:         -Wall -O2 -fno-warn-unused-do-bind
+  if flag(builder)
+    build-depends: bytestring >= 0.9, bytestring-builder
+  else
+    build-depends: bytestring >= 0.10
 
 
 test-suite properties
@@ -61,12 +66,15 @@ test-suite properties
                      , ghc-prim
 
                      , containers >= 0.4
-                     , bytestring >= 0.10
                      , attoparsec >= 0.10
 
                      , bencoding
                      , hspec
                      , QuickCheck
+  if flag(builder)
+    build-depends: bytestring >= 0.9, bytestring-builder
+  else
+    build-depends: bytestring >= 0.10
 
   ghc-options:         -Wall -fno-warn-orphans
 
@@ -81,7 +89,7 @@ benchmark bench-comparison
                      , deepseq
 
                      , attoparsec >= 0.10
-                     , bytestring >= 0.10
+                     , bytestring >= 0.9
 
                      , criterion