Linux Kernel Module Cheat

27.10. userland/libs directory

Tests under userland/libs require certain optional libraries to be installed on the target, and are not built or tested by default, you must enable them with either:

--package <package>
--package-all

See for example BLAS. Since it is located under userland/libs/openblas, it will only build with either:

./build-userland --package openblas
./build-userland --package-all

As an exception, if you first cd directly into one of the directories and do a native host build, e.g.:

sudo apt install libeigen3-dev
cd userland/libs/eigen
./build

then that library will be automatically enabled.