docs: def is_secretly_root(lib):
      """
      Detect an edge case where ROOT Minuit2 is detected as standalone
      because $ROOTSYS/lib is in LD_LIBRARY_PATH, and suggest
      appropriate countermeasures.
      """
      from distutils import ccompiler
      libdir = os.path.dirname(lib)
      cc = ccompiler.new_compiler()
      for rootlib in ("Core","MathCore"):
          if not cc.find_library_file([libdir], rootlib):
              return False
          else:
              try:
                  root_config('libdir')
                  return True
              except OSError:
                  raise RuntimeError("Found %s, which appears to be part of ROOT, but could not find root-config in PATH! To build against the standalone Minuit2, remove $ROOTSYS/lib from LD_LIBRARY_PATH; to build against the ROOT version, add $ROOTSYS/bin to your PATH" % lib)