1 files changed, 6 insertions, 1 deletions

diff --git a/base32-bytestring.cabal b/base32-bytestring.cabal
index a96d3fa..aa82911 100644
--- a/base32-bytestring.cabal
+++ b/base32-bytestring.cabal
@@ -20,6 +20,10 @@ description:
 extra-source-files:    README.md
                      , ChangeLog
 
+flag bits-extras
+  description: Use more-effecient bits-extras bitwise operations.
+  default: False
+
 source-repository head
   type:                git
   location:            git://github.com/pxqr/base32-bytestring.git
@@ -41,7 +45,8 @@ library
   build-depends:       base        == 4.*
                      , bytestring  >= 0.9
                      , cpu         == 0.1.*
-                     , bits-extras == 0.1.*
+  if flag(bits-extras)
+    build-depends:     bits-extras == 0.1.*
   ghc-options:         -O2 -Wall
 
 test-suite spec