Download the source from the github repository using following command:

git clone --recurse-submodules https://github.com/libbpf/libbpf-bootstrap.git

Install pre-requisites:

apt install binutils-dev llvm clang libcap-dev libelf-dev

Compile the first example:

cd examples/c
make minimal -j 4

Run as superuser:

sudo ./minimal
sudo cat /sys/kernel/debug/tracing/trace_pipe