anchor.diff:  
     nativeBuildInputs = [ which ];
     buildInputs = [ coq ];
  -  propagatedBuildInputs = [ bignums coquelicot flocq mathcomp ];
  +  propagatedBuildInputs = [ bignums coquelicot flocq ];
   
     configurePhase = "./configure --libdir=$out/lib/coq/${coq.coq-version}/user-contrib/Interval";
     buildPhase = "./remake";
  
positive.code: 
  let params =
    if stdenv.lib.versionAtLeast coq.coq-version "8.7" then {
      version = "3.4.0";
      uid = "37524";
      sha256 = "023j9sd64brqvjdidqkn5m8d7a93zd9r86ggh573z9nkjm2m7vvg";
    } else {
      version = "3.3.0";
      uid = "37077";
  
negative.code:   };
  
    passthru = {
      compatibleCoqVersions = v: builtins.elem v [ "8.5" "8.6" "8.7" "8.8" "8.9" "8.10" ];
    };
  
  
  