Help building Defold?


I am trying to build Defold from source. However, when I run the package/SDK install script with:

./scripts/ install_ext --platform=win32 --package-path=./packages/

It installs a few python packages but eventually crashes with the error:

  File "S:\Python27\lib\", line 283, in get_type
    raise ValueError, "unknown url type: %s" % self.__original
ValueError: unknown url type: ../packages/WindowsKits-10.0.18362.0.tar.gz

Anyone seen this before?



There should be a process to setup those WindowsKits, did you do that? Are they in that folder?

You used to have to host the WindowsKits on a local file server for it to work. It looks like the script is confused though. What OS are you on?



Running Windows 10. I installed the Windows 10 SDK manually but that didn’t help. I don’t see anything in the docs about setting up the Windows Kits specifically. Do you know where that process is shown?



I don’t remember at the moment as it was a while ago when I last tried to build the engine but @Mathias_Westerdahl will for sure know.

While waiting read the docs again and see if you accidentally skipped any step. Is the file it’s looking for not on your drive?



Yeah it’s not on my drive. It looks like from the error call stack (prior to what I posted) that it’s supposed to be finding the WindowsKits-10.0.18362.0.tar.gz on some HTTP server but instead it’s looking for it in …/packages/ instead.



There should be a step previously where you generate these files I believe.



First make sure you have all of the tools needed: This is done once.

Next you follow the steps for building the engine:

The step you didn’t complete is probably too package external SDKs for the platform you are building (Windows). For legal reasons we’re not allowed to redistribute these. You need to follow the instructions to package these yourself and make those available to our build scripts. We provide a script to download and package the required SDKs.

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Thanks, I have it now building and will report back with the results. I had to change the build script to use a slightly different version of VS 2019 community which is installed on a different drive than the build script used in order to build it since I’m running a newer version. Hopefully the minor difference in version won’t cause any issues.

Build completes fine, however I get one test failure:

Ran 48 tests, with 176 assertions in 7.98758 s
47 tests passed, 0 skipped and 1 tests FAILED
Wrote test config file: unittest_mdfgag.cfg
test failed test_socket
Traceback (most recent call last):
  File "./scripts/", line 2142, in <module>
  File "./scripts/", line 1037, in build_engine
    self._build_engine_lib(args, lib, target_platform)
  File "./scripts/", line 988, in _build_engine_lib
    run.env_command(self._form_env(), args + plf_args + self.waf_options + skip_build_tests, cwd = cwd)
  File "S:\defold\defold\build_tools\", line 63, in env_command
    return _exec_command(args, shell = False, stdout = None, env = env, **kwargs)
  File "S:\defold\defold\build_tools\", line 41, in _exec_command
    raise ExecException(process.returncode, output)

EDIT: I pressed forward with trying to get the editor working despite the test issue. I followed the steps in the editor/ however when I run lein init I see:

Initializing editor with version 'null', resolved to 'null'
Installing ../
Installing S:\defold\defold\editor\share\java\bob.jar
org.eclipse.aether.installation.InstallationException: Failed to install artifact com.defold.lib:bob:jar:1.0: S:\defold\defold\editor\share\java\bob.jar (The system cannot find the path specified)
 at org.eclipse.aether.internal.impl.DefaultInstaller.install (
    org.eclipse.aether.internal.impl.DefaultInstaller.install (
    org.eclipse.aether.internal.impl.DefaultInstaller.install (
    org.eclipse.aether.internal.impl.DefaultInstaller.install (
    org.eclipse.aether.internal.impl.DefaultRepositorySystem.install  (

I searched for the missing file (bob.jar) which I built successfully. However it shows up in the “defold\tmp\dynamo_home\share\java” directory not in the editor directory.

Thanks for any help anyone can provide :slight_smile:



What was the actual error from the test_socket?
I’m afraid what you posted is a python callstack (which we obv should fix too).

The bob.jar should be in tmp/dynamo_home/share/java/bob.jar, so that’s correct.
But, if it can’t find it, I’m wondering if you have the DYNAMO_HOME environment variable set?
If not, you set it by running:

$ ./scripts/ shell
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Ah that’s probably the problem. When I run ./scripts/ shell --platform=win32 (and without the --platform specified) it displays:

$ ./scripts/ shell --platform=win32
[exec] git remote get-url origin

Looking at the script it should say something like “Setting up shell with DYNAMO_HOME, …” but that never appears. I tried this in git bash. Do I need to run this inside msys? I’m using msys2 since Sourceforge servers are down right now.

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Yes, it should output more. (btw, no platform needed for that one):

~/work/defold $ ./scripts/ shell                                                            [issue-5128-dmsocket-dmsdk] 08:30:24
[exec] git remote get-url origin
Running 'shell'
Setting up shell with DYNAMO_HOME, PATH, ANDROID_HOME and LD_LIBRARY_PATH/DYLD_LIBRARY_PATH (where applicable) set

I don’t know if msys2 works here though (I don’t recall).
We’re creating a new shell, which it might fail?

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Yeah I tried both Git Bash and MSYS2 but both have the same issue (not running the shell, simply running the git remote get-url origin command.) Not quite sure how to proceed from here.



The command isn’t very complex, it sets a few environment variables, then creates a shell.

You can ofc set those variables manually, or modify the command to not start a new shell. It’s in



I’ve finally got the engine building and built the editor. However, when I run “lein init” I see

$ lein init
Initializing editor with version 'null', resolved to 'null'
Installing ../
Installing s:\defold_github\tmp\dynamo_home\share\java\bob.jar
java.nio.file.NoSuchFileException: s:\defold_github\tmp\dynamo_home\share\
 at sun.nio.fs.WindowsException.translateToIOException (


It looks like the documentation wasn’t built.
You might need to run that command too:

$ ./scripts/ build_docs 
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Thanks, I tried to run this but I see: ImportError: No module named script_doc_ddf_pb2



And you’ve built the engine successfully?



I think so, though not sure how to use it without the editor :blush: however I get this message:

Socket took 7.95754 s
Socket.GetHostByName_IPv4_Unavailable failed
Ran 48 tests, with 176 assertions in 7.95754 s
47 tests passed, 0 skipped and 1 tests FAILED
test failed test_socket


The editor requires the other tools to work: engine, bob, docs etc.
So one must build those things in order.

If you build with running tests, the build will stop if any errors occur.
There might be some issue with that test on Windows, so you can try to build without building+running the tests:

$ ./scripts/ build_engine --platform=x86_64-win32 --skip-codesign --skip-docs --skip-bob-light --skip-tests  -- --skip-build-tests
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Thanks, it now completes without error. However, I’m unsure how to launch it. I tried opening the launcher at \tmp\dynamo_home\bin\x86_64-win32 both in explorer and via command prompt but nothing happens and it returns without any message in command prompt. Is there some way I’m meant to start the editor?