diff --git a/pkgs/development/tools/ocaml/omake/0.9.8.6-rc1.nix b/pkgs/development/tools/ocaml/omake/0.9.8.6-rc1.nix
index 5a4b55cc7fec..090794b33116 100644
--- a/pkgs/development/tools/ocaml/omake/0.9.8.6-rc1.nix
+++ b/pkgs/development/tools/ocaml/omake/0.9.8.6-rc1.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ ocaml ncurses ];
 
-  phases = "unpackPhase patchPhase buildPhase";
+  dontInstall = true;
   buildPhase = ''
     make bootstrap
     make PREFIX=$out all