Hi @markusregner,
I haven't really tested the project, but I've just imported and built it. Is this the "S32Gx based S32G-VNP-EVBx diagnostics package version 0.8.7" package?
By "It was already not compiling any longer", do you mean in the newer versions of S32DS? Is this a new error or has this been known by the SW team since Nov?
The release notes for this package say it is supported by S32DS3.4:
--Complete suite builds out of box with S32Design Studio v3.4
After importing this project, and right clicking for "Properties", go into "C/C++ Build > Tool Chain Editor". The current toolchain for the project should show up.

Just to confirm, after downloading and importing the project, when going into properties, is the NXP GCC 9.2 toolchain selected?
Best regards,
Julián