arb-git: init at 2.9.0pre20161013. This ARB version is less annoying to use with FLINT

pkgs/development/libraries/arb/git.nix

···
+{stdenv, fetchFromGitHub, mpir, gmp, mpfr, flint}:
+stdenv.mkDerivation rec {
+  name = "${pname}-${version}";
+  pname = "arb";
+  version = "2.9.0pre20161013";
+  src = fetchFromGitHub {
+    owner = "fredrik-johansson";
+    repo = "${pname}";
+    rev = "10bc615ce5999caf4723444b2b1219b74781d8a4";
+    sha256 = "1xb40x3hv9nh76aizhskj5gdhalgn7r95a7zji2nn4ih3lmh40hl";
+  };
+  buildInputs = [mpir gmp mpfr flint];
+  configureFlags = "--with-gmp=${gmp} --with-mpir=${mpir} --with-mpfr=${mpfr} --with-flint=${flint}";
+  meta = {
+    inherit version;
+    description = ''A library for arbitrary-precision interval arithmetic'';
+    license = stdenv.lib.licenses.lgpl21Plus;
+    maintainers = [stdenv.lib.maintainers.raskin];
+    platforms = stdenv.lib.platforms.linux;
+  };
+}

pkgs/top-level/all-packages.nix

···
   };
 
   arb = callPackage ../development/libraries/arb {};
+  arb-git = callPackage ../development/libraries/arb/git.nix {};
 
   armadillo = callPackage ../development/libraries/armadillo {};