hello, when i build the os i get these errors:

14:47:39: ----- Running 'make clean' -----
14:47:39: Located c:\ethernut-4.9.2\nut\tools\win32\make.exe
14:47:41: ----- 'make clean' terminated successfully -----
14:47:41: ----- Running 'make all' -----
14:47:41: Located c:\ethernut-4.9.2\nut\tools\win32\make.exe
arm-elf-ar: creating libnutarch.a
arm-elf-ar: creating libnutos.a
arm-elf-ar: creating libnutdev.a
arm-elf-ar: creating libnutc.a
C:/ethernut-4.9.2/nut/crt/setenv.c:168: error: conflicting types for 'unsetenv'
C:/GNUARM/arm-elf/include/stdlib.h:177: error: previous declaration of 'unsetenv' was here
make[1]: *** [setenv.o] Error 1
make: *** [all] Error 2
14:47:57: ----- 'make all' failed with error 2 -----



thanks a lot, bye.