root@localnode:/home/matias/so2011# make clean
make -C /lib/modules/`uname -r`/build M=/home/matias/so2011 clean
make[1]: Entering directory `/usr/src/linux-headers-2.6.38-2-amd64'
make[1]: Leaving directory `/usr/src/linux-headers-2.6.38-2-amd64'

matias@localnode:~/so2011$ sudo make clean
make -C /lib/modules/`uname -r`/build M= clean
make[1]: Entering directory `/usr/src/linux-headers-2.6.38-2-amd64'
/usr/src/linux-headers-2.6.38-2-common/scripts/Makefile.clean:17: /usr/src/linux-headers-2.6.38-2-common/arch/x86/lib/Makefile: No such file or directory
make[4]: *** No rule to make target `/usr/src/linux-headers-2.6.38-2-common/arch/x86/lib/Makefile'.  Stop.
make[3]: *** [_clean_arch/x86/lib] Error 2
make[2]: *** [sub-make] Error 2
make[1]: *** [all] Error 2
make[1]: Leaving directory `/usr/src/linux-headers-2.6.38-2-amd64'
make: *** [clean] Error 2