Tool-CMake-Own Finder(-I -L -l)-compiling

What is a finder

• When compiling a piece of software which
  links to third­party libraries, we need to know:
  • Where to find the .h files (­I in gcc)
  • Where to find the libraries (.so/.dll/.lib/.dylib/...) (­L
    in gcc)
  • The filenames of the libraries we want to link to (­l
    in gcc)
• That's the basic information a finder needs to
  return