Knot Resolver is missing dependency proto-c for dnstap

I prepared a clean build environment and I tried to compile Knot Resolver for Turris MOX in HBL branch and it fails with the following output:

Program protoc-c found: NO

../../../../build_dir/target-aarch64_cortex-a53_musl/knot-resolver-5.5.0/modules/dnstap/meson.build:15:2: ERROR: Program 'protoc-c' not found