See Devel::CheckOS 
use Devel::CheckOS qw/ os_is /;
use if os_is(qw/ Win32 /), 'Win32::Daemon';
use if !!os_is(qw/ Win32 /), 'Proc::Daemon';

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In reply to Re: Problem with ``use if COND, Some::Module'' on Linux by Anonymous Monk
in thread Problem with ``use if COND, Some::Module'' on Linux by stevieb

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