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our $SM_UNK_REC = 1;
our $SM_HDR_REC = 2;
our $SM_TTL_REC = 3;

$stat = &slib::ABC($slib::SM_HDR_REC);

package slib;
use Exporter;
...
our @EXPORT_OK = qw/ABC $SM_UNK_REC $SM_HDR_REC $SM_TTL_REC/;

...

use slib qw/ABC $SM_UNK_REC $SM_HDR_REC $SM_TTL_REC/;
$stat = ABC(SM_HDR_REC);