Netbeans 11 with svn support :

• Install Putty (x64)
• Install Subversion (x64)
• Install TortoiseSVN

in the menu :
Team>Subversion>Checkout

• Repository url : Same old subversion repository url (svn+ssh)
• Tunnel command : plink -l anthonyarents -pw <password here>

Keep in mind, brew is VERY SLOW AND WILL TAKE A WHILE

make sure brew, caskroom & cellar have the same user+group (in my case anthonyarents:wheel)
cd /usr/local/

install svn (doesn't matter if it's already installed here)
brew install subversion

go go unsecure macbook
brew switch openssl 1.0.2s

run svn to see if it works, if you get an error about locales :
please remember people at apple are idiots who don't allow you to combine an english UI with BE or DE settings.
In other words, time to join the normies & use the correct language of your country.

ssh-keygen -t ecdsa -b 521
don't change id, leave the passphrase empty

ssh-copy-id anthonyarents@svn.jcpis.de

in the menu :
Netbeans>Preferences>Team>Versioning>Subversion

• Preferred Client : CLI
• Path to svn : /usr/local/bin

in the menu :
Team>(Subversion)>Checkout

• Repository url : Same old subversion repository url (svn+ssh)
• Tunnel command : ssh -q

If you get svnserve errors about locale (damn you apple, also need to do this step after every update) :

sudo vi /etc/ssh/ssh_config
comment out the last line (SendEnv LANG LC_*)

*pro tip: copy the file to ~/.ssh/ssh_config