nRF52840 DFU(Secure_Bootloader example) Setting

I'm want setting Secure_Bootloader.(IAR compiler, SDK 15.3version)

I followed the following guide but got stuck in Step B.

https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader

I have installed GCC compiler toolchain for ARM, MINGW, GNU Make.

But sending a make command does not compile.

I set environment variables as follows.

Please tell me what the problem is.