Hi @pt77 ,
I have attached a link to a thread that addresses this issue (https://community.nxp.com/t5/Model-Based-Design-Toolbox-MBDT/S32K34-build-error/m-p/1371545). Please check the posts here and follow the described steps which could help you with the setup of the toolbox.
Also, please note that the MBDT version you are using is not the latest one. So in case you would like to upgrade to the newest release, please download MBDT for S32K3 v1.1.0.
Hope this helps,
Irina