do{ my $x = {
       'extra_linker_flags' => [
                                 '-fprofile-arcs',
                                 '-ftest-coverage'
                               ],
       'verbose' => '1',
       'extra_compiler_flags' => [
                                   '-O0',
                                   '-fprofile-arcs',
                                   '-ftest-coverage'
                                 ],
       'install_base' => '/home/book/perl5'
     };
$x; }