/$config{LIBS} ||= backtick(/i
	    my $sdkroot = exists($ENV{SDKROOT}) ? $ENV{SDKROOT} : '';
.
/$config{LIBS} ||= backtick(/a
	    $config{LIBS} =~ s/-L/-L$sdkroot/g;
.
/$config{INC} ||= backtick(/a
	    $config{INC}  =~ s/-I/-I$sdkroot/g;
.
w