{ lib
, stdenv
, fetchurl
, cmake
, ninja
, tcl
, tk
, libGL
, libGLU
, libXext
, libXmu
, libXi
, darwin
}:

stdenv.mkDerivation rec {
  pname = "opencascade-occt";
  version = "7.8.1";
  commit = "V${builtins.replaceStrings ["."] ["_"] version}";

  src = fetchurl {
    name = "occt-${commit}.tar.gz";
    url = "https://git.dev.opencascade.org/gitweb/?p=occt.git;a=snapshot;h=${commit};sf=tgz";
    hash = "sha256-AGMZqTLLjXbzJFW/RSTsohAGV8sMxlUmdU/Y2oOzkk8=";
  };

  nativeBuildInputs = [
    cmake
    ninja
  ];

  buildInputs = [
    tcl
    tk
    libGL
    libGLU
    libXext
    libXmu
    libXi
  ] ++ lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.Cocoa;

  meta = with lib; {
    description = "Open CASCADE Technology, libraries for 3D modeling and numerical simulation";
    homepage = "https://www.opencascade.org/";
    license = licenses.lgpl21;  # essentially...
    # The special exception defined in the file OCCT_LGPL_EXCEPTION.txt
    # are basically about making the license a little less share-alike.
    maintainers = with maintainers; [ amiloradovsky gebner ];
    platforms = platforms.all;
  };

}