Errors when compiling the kernel

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http://askubuntu.com – I was compiling Linux-Libre-3.4-Gnu version using one of the tutorials I found on Ubuntu Help pages. To compile the kernel to meet 64 bit, I issued the command sudo make $x86_64_defconfig I get the following errors. I am posting the last few lins of the above command:- Setup is 16800 bytes (padded to 16896 bytes). System is 4844 kB CRC d427dc2e Kernel: arch/x86/boot/bzImage is ready (#1) Building modules, stage 2. MODPOST 3271 modules ERROR: "__modver_version_show" [drivers/staging/rts5139/rts5139.ko] undefined! WARNING: modpost: Found 5 section mismatch(es). To see full details bui (HowTos)