Building the site for tag v4.1.1 error

[haies]

It works when I built the site for latest version, however when i run the following script to build the site for tag v4.1.1 it didn't works.
treeish=v4.1.1 npm run deploy
And the output error is
Running "run:ol" (run) task npm ERR! missing script: build-legacy
so, i checkout Updating for v4.1.1 edition, then run above script,but it show the following error
Running "make:examples" (make) task info ol Parsing dependencies info ol Compiling 345 sources vents.js:183 throw er; // Unhandled 'error' event
My project already has used openlayers 4.1.1 for quite a long time, could anyone please show me the righ way to build v4.1.1 docs ?

[ahocevar]

You have to check out the correct revision of this repository before building the docs, i.e. 3c9f652:

git checkout 3c9f652c97776702eaa88f0849b0497a08d86bba
treeish=v4.1.1 npm run build

[haies]

@ahocevar Thanks a lot for taking the time to reply to my problem.
I have tried the way you suggested,
But, I still got the following errors:

Running "make:examples" (make) task
>> info
>> ol Parsing dependencies
>> info
>> ol Compiling 345 sources
>> events.js:183
>> throw er; // Unhandled 'error' event
>> ^
>>
>> Error: spawn java ENOENT
>> at _errnoException (util.js:992:11)
>> at Process.ChildProcess._handle.onexit (internal/child_process.js:190:19)
>> at onErrorNT (internal/child_process.js:372:16)
>> at _combinedTickCallback (internal/process/next_tick.js:138:11)
>> at process._tickCallback (internal/process/next_tick.js:180:9)
>> make: * [build/ol.js] Error 1
Warning: make failure: 2 Use --force to continue.

And my enviroment is :
➜ openlayers.github.io lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 9.3 (stretch)
Release: 9.3
Codename: stretch
➜ openlayers.github.io node -v
v8.11.3
➜ openlayers.github.io git --version
git version 2.11.0

[ahocevar]

It is also important to run npm install after checking out the required revision from this repository.

[haies]

I run the following script from the beginning:
git clone -b build https://github.com/openlayers/openlayers.github.io.git
cd openlayers.github.io
git pull origin build
git checkout 3c9f652c97776702eaa88f0849b0497a08d86bba
npm install
treeish=v4.1.1 npm run build
I got the same error as above, any other suggestions?