From 5f2b8de75c70498052fd1f7f96e4bb35ebeec10f Mon Sep 17 00:00:00 2001
From: Timo Kaufmann <timokau@zoho.com>
Date: Mon, 3 Dec 2018 00:44:33 +0100
Subject: [PATCH] Revert "pythonPackages.cypari2: 1.3.1 -> 2.0.1 (#49446)"
 (#51414)

This reverts commit d9b650f4cc5ba78835285963eeef8a7c23b593f8.

The update is causing segfaults. See
https://trac.sagemath.org/ticket/26442.
---
 pkgs/applications/science/math/sage/sage-src.nix   | 14 --------------
 .../development/python-modules/cypari2/default.nix |  4 ++--
 2 files changed, 2 insertions(+), 16 deletions(-)

diff --git a/pkgs/applications/science/math/sage/sage-src.nix b/pkgs/applications/science/math/sage/sage-src.nix
index b7355dca3093..5d729d9c5fdd 100644
--- a/pkgs/applications/science/math/sage/sage-src.nix
+++ b/pkgs/applications/science/math/sage/sage-src.nix
@@ -113,20 +113,6 @@ stdenv.mkDerivation rec {
       rev = "db10d327ade93711da735a599a67580524e6f7b4";
       sha256 = "09v87id25fa5r9snfn4mv79syhc77jxfawj5aizmdpwdmpgxjk1f";
     })
-
-    # https://trac.sagemath.org/ticket/26493
-    (fetchpatch {
-      name = "cypari-upgrade-dependency.patch";
-      url = "https://git.sagemath.org/sage.git/patch/?id=e93130960a1a20112bff096f53bc48ffcdfe5ab2";
-      sha256 = "03zh5288aasy47d964rs8vhaxds397rsp85ssbbrkap8702r4bjh";
-    })
-    # https://trac.sagemath.org/ticket/26442
-    (fetchpatch {
-      name = "cypari-2.0.0.patch";
-      url = "https://git.sagemath.org/sage.git/patch/?h=7905b39a510c2e09b1ebf0d4a11342bfe3c0d236";
-      sha256 = "0v8p5x1b6mnkb2j3a95iva9dmq4pxi154zz4nmj79dcyqi51crwm";
-      excludes = [ "build/*" ];
-    })
   ];
 
   patches = nixPatches ++ packageUpgradePatches;
diff --git a/pkgs/development/python-modules/cypari2/default.nix b/pkgs/development/python-modules/cypari2/default.nix
index d67bb95a91ab..a77e98dae4c8 100644
--- a/pkgs/development/python-modules/cypari2/default.nix
+++ b/pkgs/development/python-modules/cypari2/default.nix
@@ -12,11 +12,11 @@
 buildPythonPackage rec {
   pname = "cypari2";
   # upgrade may break sage, please test the sage build or ping @timokau on upgrade
-  version = "2.0.1";
+  version = "1.3.1";
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "11nqp40nji8bz4zn7j8sbzin93l65kf8s1sc76lvbsbkswaxdyij";
+    sha256 = "04f00xp8aaz37v00iqg1mv5wjq00a5qhk8cqa93s13009s9x984r";
   };
 
   # This differs slightly from the default python installPhase in that it pip-installs