Is it possible to compile the example of TrustZone for Cortex-A9 with a GNU compiler or the ARM is the only one usable?

I'm trying to compile the VersatileExpress_TrustZone_Example with a GNU compiler and it's full of errors.

I compiled the example with the ARM one ansd it worked perfectly but i only have a evaluation license to use it.

So I would like to know if there is a way to use a GNU compiler to do it, maybe by making some changes in the code?

Thanks

JohannG