[R-pkg-devel] 'library' or 'require' call not declared

You haven't shared enough info to help well, but it looks like you use
package MASS in your demo/ directory without a corresponding entry in your
DESCRIPTION file.

Add MASS as Suggests or Imports should be enough.

If you point to where your code is on GitHub or another public-facing
repository it is easier to help more specifically.

I don't understand what this message means

Flavor: r-devel-linux-x86_64-debian-gcc
Check: for unstated dependencies in 'demo', Result: NOTE
 'library' or 'require' call not declared from: 'MASS'

it is coming from HH_3.1-53.tar.gz that I sent in this evening.
It is also visible for HH_3.1-52.tar.gz on the CRAN package check page

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