when compiling ruby 2.2.0 in centos 6.4, you may meet this problem:

make[2]: Entering directory `/home/work/ruby-2.2.0/ext/fiddle'
linking shared-object fiddle.so
/usr/bin/ld: ./libffi-3.2.1/.libs/libffi.a(raw_api.o): relocation R_X86_64_32 against `.text' can not be used when making a shared object; recompile with -fPIC
./libffi-3.2.1/.libs/libffi.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make[2]: *** [../../.ext/x86_64-linux/fiddle.so] Error 1
make[2]: Leaving directory `/home/work/ruby-2.2.0/ext/fiddle'
make[1]: *** [ext/fiddle/all] Error 2
make[1]: Leaving directory `/home/work/ruby-2.2.0'
make: *** [build-ext] Error 2

it says there’s some problems with fiddle, so you may wanna reinstall fiddle-devel, which would be told by forums after googling a bit while.

actually the way that worked for me is to enter the directory of ‘ruby-2.2.0/ext/fiddle’ and do :

ruby extconf.rb
sudo make install

now have fun compiling ruby 2.2.0 ^_^

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