How to build libcsp for STM32F429 MCU on keil MDK-ARM V5.22?

Hello Everyone
I am trying to build libcsp source code for STM32F429 Cortex-M4 MCU. I am using Keil MDK-ARM V5.22 IDE for my software development. Please tell me how to configure/change wscript (waf script file) to build libcsp for STM32F429? When I run python waf configure --toolchain=MDK-ARM command I get this message:
"Program ['MDK-ARMgcc'] is not executable"

Why is there gcc at the end of MDK-ARM toolchian?

Regards,

Hammi

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