sage: 8.9.beta0 -> 8.9.beta2

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

@@ -10,14 +10,14 @@
 # all get the same sources with the same patches applied.
 
 stdenv.mkDerivation rec {
-  version = "8.9.beta0";
+  version = "8.9.beta2";
   pname = "sage-src";
 
   src = fetchFromGitHub {
     owner = "sagemath";
     repo = "sage";
     rev = version;
-    sha256 = "1bp6sdfk6h966y9jcpqnsrjfs0f5xgc1xmjw75h2y18hdgiadiy6";
+    sha256 = "1cyfdkam9inai7ps1jblagb9kl9wd8kk06m4vhbjmfymvk36q4jf";
   };
 
   # Patches needed because of particularities of nix or the way this is packaged.

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

@@ -138,8 +138,8 @@ buildPythonPackage rec {
     mkdir -p "$SAGE_SHARE/sage/ext/notebook-ipython"
     mkdir -p "var/lib/sage/installed"
 
+    source build/bin/sage-dist-helpers
     cd src
-    source bin/sage-dist-helpers
 
     ${python.interpreter} -u setup.py --no-user-cfg build
   '';