meson/test cases/failing/38 libdir must be inside prefix/test.json

{
  "do_not_set_opts": [
    "libdir"
  ],
  "stdout": [
    {
      "line": "test cases/failing/38 libdir must be inside prefix/meson.build:1:0: ERROR: The value of the 'libdir' option is '/opt/lib' which must be a subdir of the prefix '/usr'."
    }
  ]
}