sage: don't pin ntl

Now possible because of the lcalc c++11 patch.

pkgs/applications/science/math/sage/default.nix

@@ -24,7 +24,7 @@ let
       pybrial = self.callPackage ./pybrial.nix {};
 
       sagelib = self.callPackage ./sagelib.nix {
-        inherit flint ecl pari eclib ntl arb;
+        inherit flint ecl pari eclib arb;
         inherit sage-src openblas-blas-pc openblas-cblas-pc openblas-lapack-pc pynac singular;
         linbox = nixpkgs.linbox.override { withSage = true; };
       };
@@ -45,13 +45,13 @@ let
       };
 
       sage-env = self.callPackage ./sage-env.nix {
-        inherit sage-src python rWrapper openblas-cblas-pc ecl singular eclib pari palp flint pynac pythonEnv giac ntl;
+        inherit sage-src python rWrapper openblas-cblas-pc ecl singular eclib pari palp flint pynac pythonEnv;
         pkg-config = nixpkgs.pkgconfig; # not to confuse with pythonPackages.pkgconfig
       };
 
       sage-with-env = self.callPackage ./sage-with-env.nix {
-        inherit pari eclib pythonEnv ntl;
-        inherit sage-src openblas-blas-pc openblas-cblas-pc openblas-lapack-pc pynac singular giac;
+        inherit pari eclib pythonEnv;
+        inherit sage-src openblas-blas-pc openblas-cblas-pc openblas-lapack-pc pynac singular;
         pkg-config = nixpkgs.pkgconfig; # not to confuse with pythonPackages.pkgconfig
         three = nodePackages_8_x.three;
       };
@@ -106,31 +106,20 @@ let
     });
   };
 
-  # https://trac.sagemath.org/ticket/25532
-  ntl = nixpkgs.ntl.overrideAttrs (oldAttrs: rec {
-    name = "ntl-10.5.0";
-    sourceRoot = "${name}/src";
-    src = fetchurl {
-      url = "http://www.shoup.net/ntl/${name}.tar.gz";
-      sha256 = "1lmldaldgfr2b2a6585m3np5ds8bq1bis2s1ajycjm49vp4kc2xr";
-    };
-  });
-
-  giac = nixpkgs.giac.override { inherit ntl; };
   arb = nixpkgs.arb.override { inherit flint; };
 
-  singular = nixpkgs.singular.override { inherit ntl flint; };
+  singular = nixpkgs.singular.override { inherit flint; };
 
   # *not* to confuse with the python package "pynac"
   pynac = nixpkgs.pynac.override { inherit singular flint; };
 
-  eclib = nixpkgs.eclib.override { inherit pari ntl; };
+  eclib = nixpkgs.eclib.override { inherit pari; };
 
   # With openblas (64 bit), the tests fail the same way as when sage is build with
   # openblas instead of openblasCompat. Apparently other packages somehow use flints
   # blas when it is available. Alternative would be to override flint to use
   # openblasCompat.
-  flint = nixpkgs.flint.override { withBlas = false; inherit ntl; };
+  flint = nixpkgs.flint.override { withBlas = false; };
 
   # Multiple palp dimensions need to be available and sage expects them all to be
   # in the same folder.

pkgs/applications/science/math/sage/sage-src.nix

@@ -110,6 +110,7 @@ stdenv.mkDerivation rec {
       name = "pari-2.11.0.patch";
       url = "https://git.sagemath.org/sage.git/patch/?id=7af4748cab37d651eaa88be501db88f4a5ffc584";
       sha256 = "13f740ly3c19gcmhjngiycvmc3mcfj61y00i6jv0wmfgpm2z3ank";
+    })
 
     # ntl upgrade
     (fetchpatch {