or download this
cc -I/System/Library/Perl/5.18/darwin-thread-multi-2level/CORE "-DXS_V
+ERSION=\"0.011\"" "-DVERSION=\"0.011\"" -c -arch x86_64 -arch i386 -g
+ -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protect
+or -Os -o lib/PerlIO/Layers.o lib/PerlIO/Layers.c