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sbi and cbi were macros in older versions of avr-gcc. You can include <compat/deprecated.h> to correct the problem, or change the code. Instead of Code: sbi(PORTx, i); cbi(PORTx, i); you would use Code: PORTx |= (1 << i); PORTx &= ~(1 << i); 've moved up to the latest release of WinAVR. Unmodified my old code compiles as it did with the previous version. If I cause a header file to be changed, the compiler then reports a problem with fdevopen(). Firstly: ../main.c:211: warning: passing arg 1 of `fdevopen' from incompatible pointer type ../main.c:211: warning: passing arg 2 of `fdevopen' from incompatible pointer type then it complains there are too many arguments. Has something happened to fdevopen? If I remove the 3rd argument (the "0") the error disappears. If I then compile again with no further changes, it's all OK again. Any ideas anyone? TIA, Rog. The 3rd argument of fdevopen has been removed since a few avr-libc versions, it was unused anyway. For backwards compatibility, you can compile with -D__STDIO_FDEVOPEN_COMPAT_12 on the command-line.