[Android Q&A, Help & Troubleshooting] Ernes :^):
I was trying to build the kernel for my device and i ran into this:

make -j4
scripts/kconfig/conf --silentoldconfig Kconfig
drivers/input/touchscreen/mediatek/Kconfig:70:warning: ignoring unsupported char'cter '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:5:warning: ignori'g unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:6:warning: ignori'g unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:7:warning: ignori'g unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:8:warning: ignori'g unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:8:warning: ignori'g unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:12:warning: ignor'ng unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:13:warning: ignor'ng unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:14:warning: ignor'ng unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:15:warning: ignor'ng unsupported character '
drivers/input/touchscreen/mediatek/focaltech_touch_spi/Kconfig:15:warning: ignor'ng unsupported character '
CHK include/config/kernel.release
WRAP arch/arm64/include/generated/asm/bugs.h
WRAP arch/arm64/include/generated/asm/clkdev.h
WRAP arch/arm64/include/generated/asm/cputime.h
WRAP arch/arm64/include/generated/asm/delay.h
WRAP arch/arm64/include/generated/asm/div64.h
WRAP arch/arm64/include/generated/asm/dma.h
WRAP arch/arm64/include/generated/asm/dma-contiguous.h
WRAP arch/arm64/include/generated/asm/early_ioremap.h
WRAP arch/arm64/include/generated/asm/emergency-restart.h
WRAP arch/arm64/include/generated/asm/errno.h
CHK include/generated/uapi/linux/version.h
WRAP arch/arm64/include/generated/asm/hw_irq.h
WRAP arch/arm64/include/generated/asm/ioctl.h
UPD include/generated/uapi/linux/version.h
WRAP arch/arm64/include/generated/asm/ioctls.h
WRAP arch/arm64/include/generated/asm/ipcbuf.h
WRAP arch/arm64/include/generated/asm/irq_regs.h
UPD include/config/kernel.release
WRAP arch/arm64/include/generated/asm/kmap_types.h
WRAP arch/arm64/include/generated/asm/kdebug.h
WRAP arch/arm64/include/generated/asm/kvm_para.h
WRAP arch/arm64/include/generated/asm/local.h
WRAP arch/arm64/include/generated/asm/local64.h
WRAP arch/arm64/include/generated/asm/mcs_spinlock.h
WRAP arch/arm64/include/generated/asm/mm-arch-hooks.h
WRAP arch/arm64/include/generated/asm/mman.h
WRAP arch/arm64/include/generated/asm/msgbuf.h
WRAP arch/arm64/include/generated/asm/msi.h
WRAP arch/arm64/include/generated/asm/poll.h
WRAP arch/arm64/include/generated/asm/mutex.h
WRAP arch/arm64/include/generated/asm/preempt.h
WRAP arch/arm64/include/generated/asm/resource.h
WRAP arch/arm64/include/generated/asm/segment.h
WRAP arch/arm64/include/generated/asm/rwsem.h
WRAP arch/arm64/include/generated/asm/sembuf.h
WRAP arch/arm64/include/generated/asm/shmbuf.h
WRAP arch/arm64/include/generated/asm/serial.h
WRAP arch/arm64/include/generated/asm/simd.h
WRAP arch/arm64/include/generated/asm/sizes.h
WRAP arch/arm64/include/generated/asm/socket.h
WRAP arch/arm64/include/generated/asm/sockios.h
WRAP arch/arm64/include/generated/asm/swab.h
WRAP arch/arm64/include/generated/asm/switch_to.h
WRAP arch/arm64/include/generated/asm/termbits.h
WRAP arch/arm64/include/generated/asm/termios.h
WRAP arch/arm64/include/generated/asm/trace_clock.h
HOSTCC scripts/basic/fixdep
WRAP arch/arm64/include/generated/asm/types.h
WRAP arch/arm64/include/generated/asm/unaligned.h
WRAP arch/arm64/include/generated/asm/user.h
WRAP arch/arm64/include/generated/asm/vga.h
WRAP arch/arm64/include/generated/asm/xor.h
make: *** No rule to make target 'drivers/misc/mediatek/dws/mt6765/blackjack_64.dws', needed by 'arch/arm64/boot/dts/blackjack_64/cust.dtsi'. Stop.
make: *** Waiting for unfinished jobs....
WRAP arch/arm64/include/generated/uapi/asm/kvm_para.h
make[1]: Nothing to be done for 'dct/DrvGen.py'.
HOSTCC scripts/basic/bin2c

OS: Ubuntu 22.04

Kernel source code

Mediatek Chipset: MT6765