Centos 6.2 kernel compilation (2.6.32-220.4.2) failed, Solution

[Root @ SRV linux-2.6.32-220.4.2.el6] # Make bzimage
Chk include/Linux/version. h
Chk include/Linux/utsrelease. h
Symlink include/ASM-> include/asm-x86
Call scripts/checksyscils. Sh
Chk include/Linux/compile. h
CC crypto/Signature/ksign-publickey.o
Crypto/Signature/ksign-publickey.c: 2: 17: Error: Key. H: No file or directory
Crypto/Signature/ksign-publickey.c: In the 'sign _ init' function:
Crypto/Signature/ksign-publickey.c: 10: Error: 'ksign _ def_public_key 'not declared (used for the first time in this function)
Crypto/Signature/ksign-publickey.c: 10: Error :( even if it appears multiple times within a function, each undeclared identifier in its
Crypto/Signature/ksign-publickey.c: 10: error: the function in which it is located is reported only once .)
Crypto/Signature/ksign-publickey.c: 11: Error: 'ksign _ def_public_key_size 'not declared (used for the first time in this function)
Make [2]: **** [crypto/Signature/ksign-publickey.o] Error 1
Make [1]: *** [crypto/Signature] Error 2

Make: *** [crypto] Error 2

Solution: extract key. h from kernel 2.6.32-220.7 and put it into the source code folder.