make[1]: `arch/i386/kernel/asm-offsets.s' está actualizado.
  Starting the build. KBUILD_BUILTIN=1 KBUILD_MODULES=1
    CHK     include/linux/compile.h
      CC [M]  net/ipv4/ah.o
      In file included from net/ipv4/ah.c:5:
      include/net/ah.h: En la función `ah_hmac_digest':
      include/net/ah.h:26: aviso: implicit declaration of function `crypto_hmac_init'
      include/net/ah.h:27: error: `crypto_hmac_update' undeclared (first use in this function)
      include/net/ah.h:27: error: (Each undeclared identifier is reported only once
      include/net/ah.h:27: error: for each function it appears in.)
      include/net/ah.h:28: aviso: implicit declaration of function `crypto_hmac_final'
      make[2]: *** [net/ipv4/ah.o] Error 1
      make[1]: *** [net/ipv4] Error 2
      make: *** [net] Error 2