[root@localhost 2.6.18-1.2798.fc6]# ln -s /usr/src/kernels/2.6.18-1.2798.fc6-i686/ /lib/modules/2.6.18-1.2798.fc6/build
ln: creating symbolic link `/lib/modules/2.6.18-1.2798.fc6/build' to `/usr/src/kernels/2.6.18-1.2798.fc6-i686/': File exists
[root@localhost 2.6.18-1.2798.fc6]# rm /lib/modules/2.6.18-1.2798.fc6/build 
rm: remove symbolic link `/lib/modules/2.6.18-1.2798.fc6/build'? y
[root@localhost 2.6.18-1.2798.fc6]# ln -s /usr/src/kernels/2.6.18-1.2798.fc6-i686/ /lib/modules/2.6.18-1.2798.fc6/build/
ln: target `/lib/modules/2.6.18-1.2798.fc6/build/' is not a directory: No such file or directory
[root@localhost 2.6.18-1.2798.fc6]# rm /lib/modules/2.6.18-1.2798.fc6/build rm: cannot lstat `/lib/modules/2.6.18-1.2798.fc6/build': No such file or directory