require '_h2ph_pre.ph';

unless(defined(&_SYS_SWAP_H)) {
    eval 'sub _SYS_SWAP_H () {1;}' unless defined(&_SYS_SWAP_H);
    require 'features.ph';
    eval 'sub SWAP_FLAG_PREFER () {0x8000;}' unless defined(&SWAP_FLAG_PREFER);
    eval 'sub SWAP_FLAG_PRIO_MASK () {0x7fff;}' unless defined(&SWAP_FLAG_PRIO_MASK);
    eval 'sub SWAP_FLAG_PRIO_SHIFT () {0;}' unless defined(&SWAP_FLAG_PRIO_SHIFT);
}
1;
