Some examples: gcc -I../../../include -march=k8 -O2 -pipe -g0 -Wno-pointer-sign -Wall -c agc.c -o obj.x86_64-pc-linux-gnu/agc.o ar cruv ../../../lib.x86_64-pc-linux-gnu/libmodinv.a obj.x86_64-pc-linux-gnu/gauden.o obj.x86_64-pc-linux-gnu/mod_inv.o ranlib ../../../lib.x86_64-pc-linux-gnu/libcep_feat.a
fixed. already keyworded for amd64