想在X86下仿真qt4.5 按照管理员说的 但是链接错误 怎么办？

root@changxy hello_cn]# chmod 777 Makefile
[root@changxy hello_cn]# rm hello_cn
rm: remove regular file `hello_cn'? y
[root@changxy hello_cn]# make
g++  -o hello_cn hello_cn.o main.o moc_hello_cn.o     -lQtGui -lQtCore -lpthread
/usr/bin/ld: hello_cn.o: Relocations in generic ELF (EM: 40)
/usr/bin/ld: hello_cn.o: Relocations in generic ELF (EM: 40)
/usr/bin/ld: hello_cn.o: Relocations in generic ELF (EM: 40)
/usr/bin/ld: hello_cn.o: Relocations in generic ELF (EM: 40)
/usr/bin/ld: hello_cn.o: Relocations in generic ELF (EM: 40)
hello_cn.o: could not read symbols: File in wrong format
collect2: ld returned 1 exit status
make: *** [hello_cn] Error 1
[root@changxy hello_cn]# ls

解决了  先make clean  然后make 就好了