[Galaxy S 4 Mini General] 96DANGER96:
luca@luca-VirtualBox:~/CM12$ mka bootimage
============================================
PLATFORM_VERSION_CODENAME=REL
PLATFORM_VERSION=5.0
CM_VERSION=12-20141114-UNOFFICIAL-serranoltexx
TARGET_PRODUCT=cm_serranoltexx
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=krait
TARGET_2ND_ARCH=
TARGET_2ND_ARCH_VARIANT=
TARGET_2ND_CPU_VARIANT=
HOST_ARCH=x86_64
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.13.0-39-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_BUILD_TYPE=release
BUILD_ID=LRX21Q
OUT_DIR=/home/luca/CM12/out
============================================
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `src': No such file or directory
find: `phone/java': No such file or directory
find: `phone/java': No such file or directory
find: `../../../hardware/samsung/cmhw': No such file or directory
find: `dummy': No such file or directory
build/core/copy_headers.mk:15: warning: overriding commands for target `/home/luca/CM12/out/target/product/serranoltexx/obj/include/qcom/display/copybit.h'
build/core/copy_headers.mk:15: warning: ignoring old commands for target `/home/luca/CM12/out/target/product/serranoltexx/obj/include/qcom/display/copybit.h'
build/core/copy_headers.mk:15: warning: overriding commands for target `/home/luca/CM12/out/target/product/serranoltexx/obj/include/qcom/display/copybit_priv.h'
build/core/copy_headers.mk:15: warning: ignoring old commands for target `/home/luca/CM12/out/target/product/serranoltexx/obj/include/qcom/display/copybit_priv.h'
build/core/Makefile:46: warning: overriding commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/bin/rild'
build/core/base_rules.mk:550: warning: ignoring old commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/bin/rild'
build/core/Makefile:46: warning: overriding commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/lib/libreference-ril.so'
build/core/base_rules.mk:550: warning: ignoring old commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/lib/libreference-ril.so'
build/core/Makefile:46: warning: overriding commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/lib/libril.so'
build/core/base_rules.mk:550: warning: ignoring old commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/lib/libril.so'
build/core/Makefile:46: warning: overriding commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/lib/libtime_genoff.so'
build/core/base_rules.mk:550: warning: ignoring old commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/lib/libtime_genoff.so'
build/core/Makefile:46: warning: overriding commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/etc/permissions/android.software.live_wallpaper.xml'
build/core/base_rules.mk:550: warning: ignoring old commands for target `/home/luca/CM12/out/target/product/serranoltexx/system/etc/permissions/android.software.live_wallpaper.xml'
No private recovery resources for TARGET_DEVICE serranoltexx
build/core/tasks/kernel.mk:63: ***************************************************************
build/core/tasks/kernel.mk:64: * Using prebuilt kernel binary instead of source *
build/core/tasks/kernel.mk:65: * THIS IS DEPRECATED, AND WILL BE DISCONTINUED *
build/core/tasks/kernel.mk:66: * Please configure your device to download the kernel *
build/core/tasks/kernel.mk:67: * source repository to kernel/samsung/msm8930-common
build/core/tasks/kernel.mk:68: * See http://wiki.cyanogenmod.org/w/Doc:_integrated_kernel_building
build/core/tasks/kernel.mk:69: * for more information *
build/core/tasks/kernel.mk:70: ***************************************************************
make: *** No rule to make target `/home/luca/CM12/out/target/product/serranoltexx/kernel', needed by `/home/luca/CM12/out/target/product/serranoltexx/boot.img'. Stop.
make: *** Waiting for unfinished jobs....
host Executable: mkbootimg (/home/luca/CM12/out/host/linux-x86/obj32/EXECUTABLES/mkbootimg_intermediates/mkbootimg)
host Executable: acp (/home/luca/CM12/out/host/linux-x86/obj32/EXECUTABLES/acp_intermediates/acp)

Fails at start of building when builds kernel. Someone can help me?