recovery.fstab No such file or directory

[fabri8bit]

1. source build/envsetup.sh
2. lunch generic_x86-user
3. make -j4

dev@dev-Parallels-Virtual-Platform:~/Scrivania/android-x86$ make -j4

PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=4.3.1
SLIM_VERSION=
TARGET_PRODUCT=generic_x86
TARGET_BUILD_VARIANT=user
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=x86
TARGET_ARCH_VARIANT=x86
TARGET_GCC_VERSION=4.7
TARGET_USE_O3=
TARGET_CPU_VARIANT=
HOST_ARCH=x86
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.8.0-19-generic-x86_64-with-Ubuntu-13.04-raring
HOST_BUILD_TYPE=release
BUILD_ID=JLS36I

OUT_DIR=/home/dev/Scrivania/android-x86/out

Checking build tools versions...
bionic/libc/Android.mk:423: TARGET_CPU_VARIANT is not defined
grep: build/target/board/generic_x86/recovery.fstab: No such file or directory