diff --git a/pkgs/development/tools/ocaml/opam/1.0.0.nix b/pkgs/development/tools/ocaml/opam/1.0.0.nix
deleted file mode 100644
index d66b3880de2..00000000000
--- a/pkgs/development/tools/ocaml/opam/1.0.0.nix
+++ /dev/null
@@ -1,62 +0,0 @@
-{ stdenv, lib, fetchgit, fetchurl, ocaml, unzip, ncurses, curl }:
-
-assert lib.versionAtLeast ocaml.version "3.12.1";
-
-let
-  srcs = {
-    cudf = fetchurl {
-      url = "https://gforge.inria.fr/frs/download.php/31910/cudf-0.6.3.tar.gz";
-      sha256 = "6e9f1bafe859df85c854679e2904a8172945d2bf2d676c8ae3ecb72fe6de0665";
-    };
-    extlib = fetchurl {
-      url = "http://ocaml-extlib.googlecode.com/files/extlib-1.5.3.tar.gz";
-      sha256 = "c095eef4202a8614ff1474d4c08c50c32d6ca82d1015387785cf03d5913ec021";
-    };
-    ocaml_re = fetchurl {
-      url = "https://github.com/ocaml/ocaml-re/archive/ocaml-re-1.2.0.tar.gz";
-      sha256 = "a34dd9d6136731436a963bbab5c4bbb16e5d4e21b3b851d34887a3dec451999f";
-    };
-    ocamlgraph = fetchurl {
-      url = "http://ocamlgraph.lri.fr/download/ocamlgraph-1.8.1.tar.gz";
-      sha256 = "ba6388ffc2c15139b0f26330ef6dd922f0ff0f364eee99a3202bf1cd93512b43";
-    };
-    dose3 = fetchurl {
-      url = "https://gforge.inria.fr/frs/download.php/31595/dose3-3.1.2.tar.gz";
-      sha256 = "3a07a08345be157c98cb26021d7329c72c2b95c99cfdff79887690656ec9f1a3";
-    };
-    cmdliner = fetchurl {
-      url = "http://erratique.ch/software/cmdliner/releases/cmdliner-0.9.3.tbz";
-      sha256 = "5421559aa12b4debffef947f7e1039c22e9dffd87a4aa68445a687a20764ae81";
-    };
-    opam = fetchurl {
-      url = "https://github.com/OCamlPro/opam/archive/1.0.0.zip";
-      sha256 = "f8d94a91c2b8d110fa5e3b0a87c512a860acbae110654498a164c5c888c40bda";
-    };
-  };
-in
-stdenv.mkDerivation rec {
-  name = "opam-1.0.0";
-
-  buildInputs = [unzip curl ncurses ocaml];
-
-  src = srcs.opam;
-
-  postUnpack = ''
-    ln -sv ${srcs.cudf} $sourceRoot/src_ext/${srcs.cudf.name}
-    ln -sv ${srcs.extlib} $sourceRoot/src_ext/${srcs.extlib.name}
-    ln -sv ${srcs.ocaml_re} $sourceRoot/src_ext/${srcs.ocaml_re.name}
-    ln -sv ${srcs.ocamlgraph} $sourceRoot/src_ext/${srcs.ocamlgraph.name}
-    ln -sv ${srcs.dose3} $sourceRoot/src_ext/${srcs.dose3.name}
-    ln -sv ${srcs.cmdliner} $sourceRoot/src_ext/${srcs.cmdliner.name}
-  '';
-
-  makeFlags = ["HOME=$(TMPDIR)"];
-
-  doCheck = false;
-
-  meta = {
-    maintainers = [ stdenv.lib.maintainers.orbitz ];
-    description = "A package manager for OCaml";
-    platforms   = stdenv.lib.platforms.all;
-  };
-}
diff --git a/pkgs/development/tools/ocaml/opam/1.1.nix b/pkgs/development/tools/ocaml/opam/1.1.nix
deleted file mode 100644
index a8a9463bb3d..00000000000
--- a/pkgs/development/tools/ocaml/opam/1.1.nix
+++ /dev/null
@@ -1,64 +0,0 @@
-{ stdenv, lib, fetchgit, fetchurl, ocaml, unzip, ncurses, curl }:
-
-# Opam 1.1 only works with ocaml >= 3.12.1 according to ./configure
-assert lib.versionAtLeast ocaml.version "3.12.1";
-
-let
-  srcs = {
-    cudf = fetchurl {
-      url = "https://gforge.inria.fr/frs/download.php/31910/cudf-0.6.3.tar.gz";
-      sha256 = "6e9f1bafe859df85c854679e2904a8172945d2bf2d676c8ae3ecb72fe6de0665";
-    };
-    extlib = fetchurl {
-      url = "http://ocaml-extlib.googlecode.com/files/extlib-1.5.3.tar.gz";
-      sha256 = "c095eef4202a8614ff1474d4c08c50c32d6ca82d1015387785cf03d5913ec021";
-    };
-    ocaml_re = fetchurl {
-      url = "https://github.com/ocaml/ocaml-re/archive/ocaml-re-1.2.0.tar.gz";
-      sha256 = "a34dd9d6136731436a963bbab5c4bbb16e5d4e21b3b851d34887a3dec451999f";
-    };
-    ocamlgraph = fetchurl {
-      url = "http://ocamlgraph.lri.fr/download/ocamlgraph-1.8.1.tar.gz";
-      sha256 = "ba6388ffc2c15139b0f26330ef6dd922f0ff0f364eee99a3202bf1cd93512b43";
-    };
-    dose3 = fetchurl {
-      url = "https://gforge.inria.fr/frs/download.php/31595/dose3-3.1.2.tar.gz";
-      sha256 = "3a07a08345be157c98cb26021d7329c72c2b95c99cfdff79887690656ec9f1a3";
-    };
-    cmdliner = fetchurl {
-      url = "http://erratique.ch/software/cmdliner/releases/cmdliner-0.9.3.tbz";
-      sha256 = "5421559aa12b4debffef947f7e1039c22e9dffd87a4aa68445a687a20764ae81";
-    };
-    opam = fetchurl {
-      url = "https://github.com/ocaml/opam/archive/1.1.1.zip";
-      sha256 = "9c69eeb448af5a38950b2664446401ce240b9f028e0b4d26b6ac1a96938a5f03";
-    };
-  };
-in
-stdenv.mkDerivation rec {
-  name = "opam-1.1.1";
-
-  buildInputs = [unzip curl ncurses ocaml];
-
-  src = srcs.opam;
-
-  postUnpack = ''
-    ln -sv ${srcs.cudf} $sourceRoot/src_ext/${srcs.cudf.name}
-    ln -sv ${srcs.extlib} $sourceRoot/src_ext/${srcs.extlib.name}
-    ln -sv ${srcs.ocaml_re} $sourceRoot/src_ext/${srcs.ocaml_re.name}
-    ln -sv ${srcs.ocamlgraph} $sourceRoot/src_ext/${srcs.ocamlgraph.name}
-    ln -sv ${srcs.dose3} $sourceRoot/src_ext/${srcs.dose3.name}
-    ln -sv ${srcs.cmdliner} $sourceRoot/src_ext/${srcs.cmdliner.name}
-  '';
-
-  # Dirty, but apparently ocp-build requires a TERM
-  makeFlags = ["TERM=screen"];
-
-  doCheck = false;
-
-  meta = {
-    maintainers = [stdenv.lib.maintainers.orbitz];
-    description = "A package manager for OCaml";
-    platforms   = stdenv.lib.platforms.all;
-  };
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b47d7c72246..e78ab21fd81 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5123,9 +5123,7 @@ in
     nodejs = nodejs-4_x;
   };
 
-  inherit (ocaml-ng.ocamlPackages_4_01_0) opam_1_0_0;
-  inherit (ocaml-ng.ocamlPackages_4_01_0) opam_1_1;
-  inherit (ocamlPackages) opam;
+  opam = callPackage ../development/tools/ocaml/opam { };
 
   picat = callPackage ../development/compilers/picat {
     stdenv = overrideCC stdenv gcc49;
diff --git a/pkgs/top-level/ocaml-packages.nix b/pkgs/top-level/ocaml-packages.nix
index 92114a9d923..5e694f188e9 100644
--- a/pkgs/top-level/ocaml-packages.nix
+++ b/pkgs/top-level/ocaml-packages.nix
@@ -627,10 +627,6 @@ let
 
     ocaml-top = callPackage ../development/tools/ocaml/ocaml-top { };
 
-    opam_1_0_0 = callPackage ../development/tools/ocaml/opam/1.0.0.nix { };
-    opam_1_1 = callPackage ../development/tools/ocaml/opam/1.1.nix { };
-    opam = callPackage ../development/tools/ocaml/opam { };
-
     ocamlnat = callPackage  ../development/ocaml-modules/ocamlnat { };
 
     trv = callPackage ../development/tools/misc/trv { };