I have just upgraded ubuntu to 13.10 and can confirm that parallels-tools are broken. The compiler generates errors and there seems to be no patch für parallels 8.
My Log:
make[2]: Betrete Verzeichnis '/usr/src/linux-headers-3.11.0-20-generic'
CC [M] /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.o
/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.c: In function ‘prl_tg_write’:
/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.c:796:9: error: implicit declaration of function ‘PDE’ [-Werror=implicit-function-declaration]
struct tg_dev *dev = PDE(ino)->data;
...
