anchor.diff: -args@{fetchurl, composableDerivation, stdenv, perl, libxml2, postgresql, geos, proj, flex, ...}:
  +args@{fetchurl, composableDerivation, stdenv, perl, libxml2, postgresql, geos, proj, flex, gdal, pkgconfig, file, ...}:
   
     /*
   
  
positive.code:     sha256 = "0i6inyiwc5zgf5a4ssg0y774f8vn45zn5c38ccgnln9r6i54vc6k";
    });
  
    v_1_5_8 = pgDerivationBase.merge ( fix : {
      version = "1.5.8";
      sha256 = "016qn2hk3w8rg60rqn91l2nfk9zcsw0pv2s5rb1qhjw15ypgv5j8";
      sql_srcs = ["postgis.sql" "spatial_ref_sys.sql"];
    });
  
  }
  
negative.code:     };
    });
  
    pgDerivationBaseNewer = pgDerivationBase.merge (fix: {
      src = fetchurl {
        url = "http://download.osgeo.org/postgis/source/postgis-${builtins.toString fix.fixed.version}.tar.gz";
        inherit (fix.fixed) sha256;
      };
    });
  
  in rec {
  
  