ffmpeg build error

Hello I am getting the following error, not sure how to fix this?

my system info:

uname -a
Linux expression 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 02:41:37 UTC 2010 x86_64 GNU/Linux

build error

CC libavutil/utils.o
CC libavutil/x86/cpu.o
LD libavutil/libavutil.so.50
/usr/bin/ld: libavutil/mathematics.o: relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC
libavutil/mathematics.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [libavutil/libavutil.so.50] Error 1

Did you already compile it before? If so, try «make clean», run configure and compile again.