givaro: Add darwin support

pkgs/development/libraries/givaro/default.nix

···
     rev = "v${version}";
     sha256 = "199p8wyj5i63jbnk7j8qbdbfp5rm2lpmcxyk3mdjy9bz7ygx3hhy";
   };
+
+  enableParallelBuilding = true;
+
   nativeBuildInputs = [ autoreconfHook ];
   buildInputs = [autoconf automake libtool gmpxx];
+
   configureFlags = [
     "--disable-optimization"
   ] ++ stdenv.lib.optionals (!optimize) [
···
     "--disable-fma"
     "--disable-fma4"
   ];
-  doCheck = true;
+
+  # On darwin, tests are linked to dylib in the nix store, so we need to make
+  # sure tests run after installPhase.
+  doInstallCheck = true;
+  installCheckTarget = "check";
+  doCheck = false;
+
   meta = {
     inherit version;
     description = ''A C++ library for arithmetic and algebraic computations'';
     license = stdenv.lib.licenses.cecill-b;
     maintainers = [stdenv.lib.maintainers.raskin];
-    platforms = stdenv.lib.platforms.linux;
+    platforms = stdenv.lib.platforms.unix;
   };
 }