Hallo Oliver,
also ich habe deine Tips probiert leider ohne Erfolg.
Hier wieder der Auszug aus dem Log.
/usr/bin/avr-gcc -Os -Wl,--gc-sections -mmcu=atmega328p MFC_Siegendorf_v021_LINUX.o .lib/arduino.a -o MFC_Siegendorf_v021_LINUX.elf
/usr/lib/gcc/avr/4.5.3/../../../avr/lib/avr5/libc.a(log.o):../../../libm/fplib/log.S:96: relocation truncated to fit: R_AVR_13_PCREL against symbol __addsf3' defined in .text section in /usr/lib/gcc/avr/4.5.3/avr5/libgcc.a(_addsub_sf.o) /usr/lib/gcc/avr/4.5.3/../../../avr/lib/avr5/libc.a(log.o):../../../libm/fplib/log.S:100: relocation truncated to fit: R_AVR_13_PCREL against symbol __addsf3' defined in .text section in /usr/lib/gcc/avr/4.5.3/avr5/libgcc.a(_addsub_sf.o)
/usr/lib/gcc/avr/4.5.3/../../../avr/lib/avr5/libc.a(log.o):../../../libm/fplib/log.S:116: relocation truncated to fit: R_AVR_13_PCREL against symbol `__floatsisf' defined in .text section in /usr/lib/gcc/avr/4.5.3/avr5/libgcc.a(_si_to_sf.o)
collect2: ld returned 1 exit status
make: *** [MFC_Siegendorf_v021_LINUX.elf] Fehler 1
Hier findest du mein Makefile .... http://ed.am/dev/make/arduino-mk/arduino.mk