buildroot/package/ .mk config.in

These are three different files used in the Buildroot build system:

1. `buildroot/package/*.mk`: These are Makefiles used to build packages for the target system. They contain information about the package source, compilation flags, installed files, and dependencies.

2. `buildroot/package/config.in`: This file defines the configuration options for each package. It is used by the Buildroot menuconfig tool to allow users to select which packages to include in the build.

3. `buildroot/config.in`: This file defines the global configuration options for the Buildroot build system. It is also used by the menuconfig tool to allow users to configure options such as the target architecture, toolchain, and build options.

Together, these files provide the necessary information for the Buildroot build system to create a customized root filesystem for the target system.