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 if index($config->{LIBS}, $sdkroot) < 0;
6.
7/$config->{INC}  = backtick(/a
8	$config->{INC}  =~ s/-I/-I$sdkroot/g if index($config->{INC}, $sdkroot) < 0;
9.
10w
11