Checking if your kit is complete... Looks good Testing if you have a C compiler and the needed header files.... cc -c -o compile.o compile.c You have a working compiler. Checking if your kit is complete... Looks good Writing Makefile for NetAddr::IP::Util Writing Makefile for NetAddr::IP::Lite cp Lite.pm blib/lib/NetAddr/IP/Lite.pm ./siteconf "gcc" ".c" ".o" "" "-fno-common -DPERL_DARWIN -no-cpp-precomp -arch ppc -arch i386 -nostdinc -B/Developer/SDKs/MacOSX10.4u.sdk/usr/include/gcc -B/Developer/SDKs/MacOSX10.4u.sdk/usr/lib/gcc -isystem/Developer/SDKs/MacOSX10.4u.sdk/usr/include -F/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks -mmacosx-version-min=10.3 -DUSE_SITECUSTOMIZE -DNO_HASH_SEED -fno-strict-aliasing -pipe" "" "" checking for char... yes checking size of char... siteconf: error: cannot compute sizeof (char), 77 make[1]: *** [localStuff.h] Error 1 make: *** [subdirs] Error 2