Adding a package error

    Hi,

    I followed adding_a_package [LibreELEC]

    I get the error:

    Code
    PROJECT=RPi2 ARCH=ARM scripts/build tslib
=================================================================================
 ERROR: Architecture not found, use a valid Architecture
 for your project or create a new config
 =================================================================================

 Valid Architectures for your project: RPi2
 - arm

    Why? I can compile the whole image without any error. Why not only 1 package?