if (grep { $_ eq 'PERL_CORE=1' } @ARGV) {
    # Core
    push(@conditional_params, 'MAN3PODS' => {},
                              'NORECURS' => 1);
}

##</code><code>##

threads.xs: In function 'S_ithread_run':
threads.xs:526: error: 'G_WANT' undeclared (first use in this function)
threads.xs:526: error: (Each undeclared identifier is reported only once
threads.xs:526: error: for each function it appears in.)
threads.xs: In function 'XS_threads_join':
threads.xs:1224: error: 'G_WANT' undeclared (first use in this function)
threads.xs: In function 'XS_threads_wantarray':
threads.xs:1561: error: 'G_WANT' undeclared (first use in this function)
make: *** [threads.o] Error 1