[Android Software/Hacking General [Developers Only]] XolYnrac:
Some idea to solve that ???

5 warnings generated.
[ 0% 341/79612] Building Kernel Config
make: Entering directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996'
make[1]: Entering directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ'
GEN ./Makefile
#
# configuration written to .config
#
make[1]: Leaving directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ'
make: Leaving directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996'
make: Entering directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996'
make[1]: Entering directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ'
GEN ./Makefile
scripts/kconfig/conf --savedefconfig=defconfig Kconfig
make[1]: Leaving directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ'
make: Leaving directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996'
[ 4% 3376/79612] Building Kernel
FAILED: TARGET_KERNEL_BINARIES
/bin/bash -c "(rm -rf /media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/system/vendor/lib/modules ) && (mkdir -p /media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/system/vendor/lib/modules ) && (rm -rf /media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/PACKAGING/depmod_vendor_intermediates ) && (make -j4 CFLAGS_MODULE=\"-fno-pic\" -C kernel/lge/msm8996 O=/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ ARCH=arm64 CROSS_COMPILE=\"/usr/bin/ccache aarch64-linux-android-\" Image.gz-dtb ) && (if grep -q '^CONFIG_OF=y' /media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ/.config; then	echo \"Building DTBs\";	make -j4 CFLAGS_MODULE=\"-fno-pic\" -C kernel/lge/msm8996 O=/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ ARCH=arm64 CROSS_COMPILE=\"/usr/bin/ccache aarch64-linux-android-\" dtbs;	fi ) && (if grep -q '^CONFIG_MODULES=y' /media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ/.config; then	echo \"Building Kernel Modules\";	make -j4 CFLAGS_MODULE=\"-fno-pic\" -C kernel/lge/msm8996 O=/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ ARCH=arm64 CROSS_COMPILE=\"/usr/bin/ccache aarch64-linux-android-\" modules;	fi )"
make: Entering directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996'
make[1]: Entering directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ'
GEN ./Makefile
scripts/kconfig/conf --silentoldconfig Kconfig
CHK include/config/kernel.release
GEN ./Makefile
CHK include/generated/uapi/linux/version.h
Using /media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996 as source for kernel
CHK include/generated/utsrelease.h
CALL /media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996/scripts/checksyscalls.sh
make[2]: 'include/generated/vdso-offsets.h' is up to date.
CHK include/generated/compile.h
/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996/kernel/Makefile:145: *** No X.509 certificates found ***
GZIP kernel/config_data.gz
CHK kernel/config_data.h
LINK vmlinux
LD vmlinux.o
MODPOST vmlinux.o
GEN .version
CHK include/generated/compile.h
UPD include/generated/compile.h
CC init/version.o
LD init/built-in.o
kernel/built-in.o:(.rodata+0x3ee0): undefined reference to `schedtune_cgrp_subsys'
/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996/Makefile:951: recipe for target 'vmlinux' failed
make[1]: *** [vmlinux] Error 1
make[1]: Leaving directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/out/target/product/h990/obj/KERNEL_OBJ'
Makefile:145: recipe for target 'sub-make' failed
make: *** [sub-make] Error 2
make: Leaving directory '/media/xolynrac/f0593918-feb5-4077-82a3-9c1b21dc570e/h990_15.1_src/kernel/lge/msm8996'
[ 4% 3385/79612] //external/libchrome:libchrome clang++ base/message_loop/incoming_task_queue.cc
ninja: build stopped: subcommand failed.
18:24:17 ninja failed with: exit status 1

#### failed to build some targets (05:32 (mm:ss)) ####