The tcpip examples for S32K396 is slightly broken and can not build out of the box.
The following two files need to be excluded from the project to build:
RTD/src/EthIf.c
stacks/tcpip/lwip/src/apps/http/fsdata.c
The example project for S32K344 does exclude these files, but the example project for S32K396 does not exclude these files, resulting in build errors.