diff --git a/pkgs/development/libraries/libgumath/default.nix b/pkgs/development/libraries/libgumath/default.nix
index 27a10507a58..55e89d87664 100644
--- a/pkgs/development/libraries/libgumath/default.nix
+++ b/pkgs/development/libraries/libgumath/default.nix
@@ -6,13 +6,13 @@
 
 stdenv.mkDerivation {
   pname = "libgumath";
-  version = "unstable-2018-11-27";
+  version = "unstable-2019-08-01";
 
   src = fetchFromGitHub {
-    owner = "plures";
+    owner = "xnd-project";
     repo = "gumath";
-    rev = "5a9d27883b40432246d6a93cd6133157267fd166";
-    sha256 = "0w2qzp7anxd1wzkvv5r2pdkkpgrnqzgrq47lrvpqc1i1wqzcwf0w";
+    rev = "360ed454105ac5615a7cb7d216ad25bc4181b876";
+    sha256 = "1wprkxpmjrk369fpw8rbq51r7jvqkcndqs209y7p560cnagmsxc6";
   };
 
   buildInputs = [ libndtypes libxnd ];
diff --git a/pkgs/development/python-modules/gumath/default.nix b/pkgs/development/python-modules/gumath/default.nix
index 2937b876dec..ccf1627d7f3 100644
--- a/pkgs/development/python-modules/gumath/default.nix
+++ b/pkgs/development/python-modules/gumath/default.nix
@@ -1,4 +1,6 @@
-{ buildPythonPackage
+{ stdenv
+, buildPythonPackage
+, python
 , numba
 , ndtypes
 , xnd
@@ -25,4 +27,20 @@ buildPythonPackage {
       --replace 'add_runtime_library_dirs = ["$ORIGIN"]' \
                 'add_runtime_library_dirs = ["${libndtypes}/lib", "${libxnd}/lib", "${libgumath}/lib"]'
   '';
+
+  postInstall = stdenv.lib.optionalString stdenv.isDarwin ''
+    install_name_tool -add_rpath ${libgumath}/lib $out/${python.sitePackages}/gumath/_gumath.*.so
+  '';
+
+  checkPhase = ''
+    pushd python
+    mv gumath _gumath
+    # minor precision issues
+    substituteInPlace test_gumath.py --replace 'test_sin' 'dont_test_sin'
+    python test_gumath.py
+    python test_xndarray.py
+    popd
+  '';
+
 }
+