Trying to find a suitable vmmon module for your running kernel. None of the pre-built vmmon modules for VMware Workstation is suitable for your running kernel. Do you want this program to try to build the vmmon module for your system (you need to have a C compiler installed on your system)? [yes] Using compiler "/usr/bin/gcc". Use environment variable CC to override. What is the location of the directory of C header files that match your running kernel? [/usr/src/linux/include] /lib/modules/2.6.16-1.2111_FC5/build/include The kernel defined by this directory of header files does not have the same address space size as your running kernel.