require '_h2ph_pre.ph';

no warnings qw(redefine misc);

unless(defined(&_SYS_CALLBACK_H_)) {
    eval 'sub _SYS_CALLBACK_H_ () {1;}' unless defined(&_SYS_CALLBACK_H_);
    require 'sys/queue.ph';
    require 'sys/mutex.ph';
    require 'sys/condvar.ph';
    eval 'sub CALLBACK_CHAIN_CONTINUE () {0;}' unless defined(&CALLBACK_CHAIN_CONTINUE);
    eval 'sub CALLBACK_CHAIN_ABORT () {1;}' unless defined(&CALLBACK_CHAIN_ABORT);
}
1;
