1/$config{LIBS} ||= backtick(/i
2	    my $sdkroot = exists($ENV{SDKROOT}) ? $ENV{SDKROOT} : '';
3.
4/$config{LIBS} ||= backtick(/a
5	    $config{LIBS} =~ s/-L/-L$sdkroot/g;
6.
7/$config{INC} ||= backtick(/a
8	    $config{INC}  =~ s/-I/-I$sdkroot/g;
9.
10w
11