me@machine $ sudo gem install sendfile
Building native extensions.  This could take a while...
ERROR:  Error installing sendfile:
	ERROR: Failed to build gem native extension.

/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb install sendfile
creating Makefile

make
gcc -I. -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin9.0 -I/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/universal-darwin9.0 -I.  -fno-common -arch ppc -arch i386 -Os -pipe -fno-common  -c sendfile.c
sendfile.c: In function ‘rb_io_sendfile’:
sendfile.c:141: error: storage size of ‘s’ isn’t known
sendfile.c: In function ‘rb_io_sendfile’:
sendfile.c:141: error: storage size of ‘s’ isn’t known
lipo: can't open input file: /var/tmp//ccR39IKv.out (No such file or directory)
make: *** [sendfile.o] Error 1


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/sendfile-0.9.2 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/sendfile-0.9.2/ext/gem_make.out