Comment 5 for bug 1880419

> Abosulety! However, it'll require an actual test case.

```
#!/bin/bash
cleanup() {
  rm -rf "$1"
}
set -e
testdir="$(mktemp -d)"
trap "cleanup ${testdir}" EXIT
pushd "${testdir}"
cat <<EOF > CMakeLists.txt
cmake_minimum_required(VERSION 3.16 FATAL_ERROR)
project(yaml-cpp-test LANGUAGES CXX)
find_package(yaml-cpp)
get_filename_component(YAML_CPP_INCLUDE_DIR
  "\${YAML_CPP_INCLUDE_DIR}" REALPATH BASE_DIR "/")
message(STATUS "YAML_CPP_INCLUDE_DIR: \${YAML_CPP_INCLUDE_DIR}")
if(NOT YAML_CPP_INCLUDE_DIR STREQUAL "/usr/include")
  message(FATAL_ERROR "Wrong value exported in YAML_CPP_INCLUDE_DIR")
endif()
EOF
cmake -S. -Bbuild
```

You may run this bash script as a test.

Our users are also affected by this bug, +1 for fixing it in 20.04 LTS. Thx!