No space left on device error message while compiling new kernel

I've decided gain a bit more performance and compile customized kernel. I installed kernel-source package. After I made needed customization (using make menuconfig command) I launched command. But at some stage of the process I am getting error message "no space left on device". And indeed, /usr/src/packages/BUILD directory is more then six gigabytes in size. What to do? Kernel version is 3.7.10-1.16. OpenSUSE 12.3 sixty-four bit.