anchor.diff:        stripLen = 1;
       })
   
  -    # https://trac.sagemath.org/ticket/27653
  -    (fetchpatch {
  -      name = "sympy-1.4.patch";
  -      url = "https://git.sagemath.org/sage.git/patch/?h=3277ba76d0ba7174608a31a0c6623e9210c63e3d";
  -      sha256 = "09avaanwmdgqv14mmllbgw9z2scf4lc0y0kzdhlriiq8ss9j8iir";
  -    })
  -
       # https://trac.sagemath.org/ticket/27738
       (fetchpatch {
         name = "R-3.6.0.patch";
  
positive.code:     # https://trac.sagemath.org/ticket/27660#ticket
      ./patches/do-not-test-find-library.patch
  
      # https://trac.sagemath.org/ticket/27766
      (fetchpatch {
        name = "more-optional-build-tags.patch";
        url = "https://git.sagemath.org/sage.git/patch/?id=a6deff761da469fad57eae498e639d6166fd78ed";
        sha256 = "02qb9r3p0vgb9q5hhrp41mcgrk1gxrl02fmp486gnrym3cqnw5n1";
      })
  
      # https://trac.sagemath.org/ticket/28007
      ./patches/threejs-offline.patch
  
negative.code:       base = "8.8.beta4";
        rev = "c11d9cfa23ff9f77681a8f12742f68143eed4504";
        sha256 = "0xzra7mbgqvahk9v45bjwir2mqz73hrhhy314jq5nxrb35ysdxyi";
      })
    ];
  
  