Using 2.6.x kernel build system.
make: Entering directory `/tmp/vmware-config3/vmmon-only'
make -C /usr/src/linux/include/.. SUBDIRS=$PWD SRCROOT=$PWD/. modules
make[1]: Entering directory `/usr/src/linux-2.6.21.5'
CC [M] /tmp/vmware-config3/vmmon-only/linux/driver.o
In file included from /tmp/vmware-config3/vmmon-only/linux/driver.c:80:
/tmp/vmware-config3/vmmon-only/./include/compat_kernel.h:21: error: expected declaration specifiers or '...' before 'compat_exit'
/tmp/vmware-config3/vmmon-only/./include/compat_kernel.h:21: error: expected declaration specifiers or '...' before 'exit_code'
/tmp/vmware-config3/vmmon-only/./include/compat_kernel.h:21: warning: type defaults to 'int' in declaration of '_syscall1'
make[2]: *** [/tmp/vmware-config3/vmmon-only/linux/driver.o] Error 1
make[1]: *** [_module_/tmp/vmware-config3/vmmon-only] Error 2
make[1]: Leaving directory `/usr/src/linux-2.6.21.5'
make: *** [vmmon.ko] Error 2
make: Leaving directory `/tmp/vmware-config3/vmmon-only'
Unable to build the vmmon module.