Hello, I would like to give me some advice for this problem I compile and run a c++ program on 32bit sistem ; it works very well but running it on a 64bit system gives me the following errors $ make cc -O2 -c -o obsr.o obsr.c cc -O2 -c -o ro.o ro.c cc -O2 -c -o tag.o tag.c as -o hit.o hit.s as -o hintm1.o hintm1.s hintm1.s: Assembler messages: hintm1.s:72: Error: suffix or operands invalid for `push' hintm1.s:74: Error: suffix or operands invalid for `push' hintm1.s:75: Error: suffix or operands invalid for `push' hintm1.s:76: Error: suffix or operands invalid for `push' hintm1.s:94: Error: suffix or operands invalid for `push' hintm1.s:95: Error: suffix or operands invalid for `push' hintm1.s:122: Error: suffix or operands invalid for `push' hintm1.s:139: Error: suffix or operands invalid for `push' hintm1.s:153: Error: suffix or operands invalid for `push' hintm1.s:154: Error: suffix or operands invalid for `push' hintm1.s:224: Error: suffix or operands invalid for `push' hintm1.s:225: Error: suffix or operands invalid for `push' hintm1.s:226: Error: suffix or operands invalid for `push' hintm1.s:227: Error: suffix or operands invalid for `push' hintm1.s:235: Error: suffix or operands invalid for `push' hintm1.s:236: Error: suffix or operands invalid for `push' hintm1.s:237: Error: suffix or operands invalid for `push' hintm1.s:262: Warning: translating to `fld %st(1)' hintm1.s:436: Warning: translating to `fld %st(3)' hintm1.s:633: Warning: translating to `fld %st(3)' hintm1.s:683: Error: suffix or operands invalid for `pop' hintm1.s:684: Error: suffix or operands invalid for `pop' hintm1.s:685: Error: suffix or operands invalid for `pop' hintm1.s:686: Error: suffix or operands invalid for `pop' hintm1.s:734: Error: suffix or operands invalid for `pop' hintm1.s:735: Error: suffix or operands invalid for `pop' hintm1.s:736: Error: suffix or operands invalid for `pop' make: *** [hintm1.o] Error 1 I think the problem is with assembler Please let me know how I must to proceed for running the program Thanks & Regards, tony