And finally create a file Makefile.PL that looks like this:

use ExtUtils::MakeMaker;
$Verbose = 1;
WriteMakefile(
    NAME   => 'Mytest2::mylib',
    SKIP   => [qw(all static static_lib dynamic dynamic_lib)],
    clean  => {'FILES' => 'libmylib$(LIB_EXT)'},
);


sub MY::top_targets {
        '
all :: static

pure_all :: static

static ::       libmylib$(LIB_EXT)

libmylib$(LIB_EXT): $(O_FILES)
        $(AR) cr libmylib$(LIB_EXT) $(O_FILES)
        $(RANLIB) libmylib$(LIB_EXT)

';
}


##</code><code>##

WriteMakefile(
    NAME   => 'Mytest2::mylib',
);
#no MY

##</code><code>##

sub MY::postamble {
'
$(MYEXTLIB): mylib/Makefile
        cd mylib && $(MAKE) $(PASSTHRU)
';
}