[Buildroot] defconfig fragments

[Bassem Fahmy]

Hello,

I understand that buildroot supports config fragments for packages (that support defconfig).

But to patch the buildroot defconfig itself, the only way I could do it, is by calling 
> support/kconfig/merge_config.h xxxx_defconfig xxxx.config

Is this the correct way? Is there a more standard way to patch a buildroot defconfig?

Regards,
Bassem