I am wondering the same thing. Here is error log.
Start installation of prl_eth kernel module
make: Entering directory `/usr/lib/parallels-tools/kmods'
cd prl_eth/pvmnet && make
make[1]: Entering directory `/usr/lib/parallels-tools/kmods/prl_eth/pvmnet'
make -C /lib/modules/2.6.33.5-112.fc13.i686/build M=/usr/lib/parallels-tools/kmods/prl_eth/pvmnet
make[2]: Entering directory `/usr/src/kernels/2.6.33.5-112.fc13.i686'
LD /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/built-in.o
CC [M] /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/pvmnet.o
LD [M] /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/prl_eth.o
Building modules, stage 2.
MODPOST 1 modules
WARNING: modpost: missing MODULE_LICENSE() in /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/prl_eth.o
see include/linux/module.h for more information
CC /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/prl_eth.mod.o
LD [M] /usr/lib/parallels-tools/kmods/prl_eth/pvmnet/prl_eth.ko
make[2]: Leaving directory `/usr/src/kernels/2.6.33.5-112.fc13.i686'
make[1]: Leaving directory `/usr/lib/parallels-tools/kmods/prl_eth/pvmnet'
cd prl_tg/Toolgate/Guest/Linux/prl_tg && make
make[1]: Entering directory `/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg'
make -C /lib/modules/2.6.33.5-112.fc13.i686/build SUBDIRS=/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg SRCROOT=/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg modules
make[2]: Entering directory `/usr/src/kernels/2.6.33.5-112.fc13.i686'
CC [M] /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.o
LD [M] /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prl_tg.o
Building modules, stage 2.
MODPOST 1 modules
WARNING: modpost: missing MODULE_LICENSE() in /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prl_tg.o
see include/linux/module.h for more information
WARNING: modpost: Found 3 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
CC /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prl_tg.mod.o
LD [M] /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prl_tg.ko
make[2]: Leaving directory `/usr/src/kernels/2.6.33.5-112.fc13.i686'
make[1]: Leaving directory `/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg'
cp -f prl_tg/Toolgate/Guest/Linux/prl_tg/*.symvers prl_fs/SharedFolders/Guest/Linux/prl_fs ||:
cd prl_fs/SharedFolders/Guest/Linux/prl_fs && make
make[1]: Entering directory `/usr/lib/parallels-tools/kmods/prl_fs/SharedFolders/Guest/Linux/prl_fs'