diff --git a/brainheck.cabal b/brainheck.cabal
--- a/brainheck.cabal
+++ b/brainheck.cabal
@@ -1,5 +1,5 @@
 name:                brainheck
-version:             0.1.0.2
+version:             0.1.0.3
 synopsis:            Brainh*ck interpreter in haskell
 description:         Brainh*ck interpreter written in haskell and taking advantage of many prominent libraries
 homepage:            https://github.com/vmchale/brainheck#readme
@@ -16,6 +16,11 @@
                    , default.nix
                    , release.nix
 cabal-version:       >=1.10
+
+Flag llvm-fast {
+  Description: Enable build with llvm backend
+  Default: False
+}
 
 library
   hs-source-dirs:      src