How to set sysroot settings using Developer Studio


I have a question about Makefile which is automatically generated by
Developer Studio.

I would like to change the following sysroot settings using
environment variable.
Could you tell me how to set it using Developer Studio, if there is
any information?

–sysroot /home/myWorkspace/leaf-data/wp76stable/wp76-toolchain/sysroots/armv7a-neon-poky-linux-gnueabi

–sysroot $(SDKDIR)/leaf-data/wp76stable/wp76-toolchain/sysroots/armv7a-neon-poky-linux-gnueabi


how about change there following?
properties->c/C++ Build ->Enviornment -> change the variable there

Or you can see here on how to import leaf package to Developer studio: