# File lib/mkmf.rb, line 290
def cpp_command(outfile, opt="")
  conf = Config::CONFIG.merge('hdrdir' => $hdrdir.quote, 'srcdir' => $srcdir.quote)
  Config::expand("$(CPP) #$INCFLAGS #$CPPFLAGS #$CFLAGS #{opt} #{CONFTEST_C} #{outfile}",
                 conf)
end