arb: init at 2.8.1

pkgs/development/libraries/arb/default.nix

···
+{stdenv, fetchFromGitHub, mpir, gmp, mpfr, flint}:
+stdenv.mkDerivation rec {
+  name = "${pname}-${version}";
+  pname = "arb";
+  version = "2.8.1";
+  src = fetchFromGitHub {
+    owner = "fredrik-johansson";
+    repo = "${pname}";
+    rev = "${version}";
+    sha256 = "15phk71ci9rr32aqznpkd2b993wjahsgliilkg4mnxsr86nwdf6x";
+  };
+  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

···
     #      apr with db58 on freebsd (nov 2015), for unknown reasons
   };
 
+  arb = callPackage ../development/libraries/arb {};
+
   armadillo = callPackage ../development/libraries/armadillo {};
 
   assimp = callPackage ../development/libraries/assimp { };