MakeMakefile#find_library

# File tmp/rubies/ruby-4.1.0-preview1/lib/mkmf.rb, line 1160
def find_library(lib, func, *paths, &b)
  dir_config(lib)
  lib = with_config(lib+'lib', lib)
  paths = paths.flat_map {|path| path.split(File::PATH_SEPARATOR)}
  checking_for checking_message(func && func.funcall_style, LIBARG%lib) do
    libpath = $LIBPATH
    libs = append_library($libs, lib)
    begin
      until r = try_func(func, libs, &b) or paths.empty?
        $LIBPATH = libpath | [paths.shift]
      end
      if r
        $libs = libs
        libpath = nil
      end
    ensure
      $LIBPATH = libpath if libpath
    end
    r
  end
end