make issue

[GarethHards]

i followed the steps on : https://thepihut.com/blogs/raspberry-pi-tutorials/how-to-setup-a-rtl881cu-usb-wifi-adapter-with-the-raspberry-pi-4 and in the file folder tried make and this was the result:

pi@raspberrypi:/usbwifi $ cd rtl8821CU
pi@raspberrypi:/usbwifi/rtl8821CU $ make
make ARCH=arm CROSS_COMPILE= -C /lib/modules/5.10.11-v7l+/build M=/home/pi/usbwifi/rtl8821CU modules
make[1]: *** /lib/modules/5.10.11-v7l+/build: No such file or directory. Stop.
make: *** [Makefile:1923: modules] Error 2
pi@raspberrypi:~/usbwifi/rtl8821CU $

[GarethHards]

######### Notify SDIO Host Keep Power During Syspend ##########
CONFIG_RTW_SDIO_PM_KEEP_POWER = y
###################### MP HW TX MODE FOR VHT #######################
CONFIG_MP_VHT_HW_TX_MODE = n
###################### Platform Related #######################
CONFIG_PLATFORM_I386_PC = n
CONFIG_PLATFORM_ARM_RPI = y
CONFIG_PLATFORM_ARM_RPI3 = n
CONFIG_PLATFORM_ANDROID_X86 = n
CONFIG_PLATFORM_ANDROID_INTEL_X86 = n
CONFIG_PLATFORM_JB_X86 = n
CONFIG_PLATFORM_ARM_S3C2K4 = n
CONFIG_PLATFORM_ARM_PXA2XX = n
CONFIG_PLATFORM_ARM_S3C6K4 = n
CONFIG_PLATFORM_MIPS_RMI = n
CONFIG_PLATFORM_RTD2880B = n
CONFIG_PLATFORM_MIPS_AR9132 = n
CONFIG_PLATFORM_RTK_DMP = n
CONFIG_PLATFORM_MIPS_PLM = n

i got upto here and edit the file like the blog said i should

[GarethHards]

pi@raspberrypi:~ $ DRV_NAME=rtl8821CU
pi@raspberrypi:~ $ DRV_VERSION=5.2.5.3
pi@raspberrypi:~ $ sudo mkdir /usr/src/${DRV_NAME}-${DRV_VERSION}
pi@raspberrypi:~ $ git archive master | sudo tar -x -C /usr/src/${DRV_NAME}-${DRV_VERSION}
fatal: not a git repository (or any of the parent directories): .git
tar: This does not look like a tar archive
tar: Exiting with failure status due to previous errors
pi@raspberrypi:~ $ sudo dkms add -m ${DRV_NAME} -v ${DRV_VERSION}
Error! Could not locate dkms.conf file.
File: /usr/src/rtl8821CU-5.2.5.3/dkms.conf does not exist.
pi@raspberrypi:~ $ sudo dkms build -m ${DRV_NAME} -v ${DRV_VERSION}
Error! Could not locate dkms.conf file.
File: /usr/src/rtl8821CU-5.2.5.3/dkms.conf does not exist.
pi@raspberrypi:~ $ sudo dkms install -m ${DRV_NAME} -v ${DRV_VERSION}
Error! Could not locate dkms.conf file.
File: /usr/src/rtl8821CU-5.2.5.3/dkms.conf does not exist.
pi@raspberrypi:~ $

[GarethHards]

pi@raspberrypi:~ $ cd usbwifi
pi@raspberrypi:/usbwifi $ cd rtl8821CU
pi@raspberrypi:/usbwifi/rtl8821CU $ sudo apt-get install dkms
Reading package lists... Done
Building dependency tree
Reading state information... Done
dkms is already the newest version (2.6.1-4).
The following packages were automatically installed and are no longer required:
gconf-service gconf2-common libexiv2-14 libgconf-2-4 libgfortran3
libgmime-2.6-0 libncurses5 libssl1.0.2 rpi-eeprom-images uuid-dev
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
pi@raspberrypi:/usbwifi/rtl8821CU $ DRV_NAME=rtl8821CU
pi@raspberrypi:/usbwifi/rtl8821CU $ DRV_VERSION=5.2.5.3
pi@raspberrypi:/usbwifi/rtl8821CU $ sudo mkdir /usr/src/${DRV_NAME}-${DRV_VERSION}
mkdir: cannot create directory ‘/usr/src/rtl8821CU-5.2.5.3’: File exists
pi@raspberrypi:/usbwifi/rtl8821CU $ git archive master | sudo tar -x -C /usr/src/${DRV_NAME}-${DRV_VERSION}
pi@raspberrypi:~/usbwifi/rtl8821CU $ sudo dkms add -m ${DRV_NAME} -v ${DRV_VERSION}

Creating symlink /var/lib/dkms/rtl8821CU/5.2.5.3/source ->
/usr/src/rtl8821CU-5.2.5.3

DKMS: add completed.
pi@raspberrypi:/usbwifi/rtl8821CU $ sudo dkms build -m ${DRV_NAME} -v ${DRV_VERSION}
Error! echo
Your kernel headers for kernel 5.10.11-v7l+ cannot be found at
pi@raspberrypi:/usbwifi/rtl8821CU $ sudo dkms install -m ${DRV_NAME} -v ${DRV_VERSION}
Error! echo
Your kernel headers for kernel 5.10.11-v7l+ cannot be found at
/lib/modules/5.10.11-v7l+/build or /lib/modules/5.10.11-v7l+/source.
pi@raspberrypi:~/usbwifi/rtl8821CU $

[GarethHards]

pi@raspberrypi:~ $ sudo apt install raspberrypi-kernel-headers
Reading package lists... Done
Building dependency tree
Reading state information... Done
raspberrypi-kernel-headers is already the newest version (1.20210108-1).
raspberrypi-kernel-headers set to manually installed.
The following packages were automatically installed and are no longer required:
gconf-service gconf2-common libexiv2-14 libgconf-2-4 libgfortran3
libgmime-2.6-0 libncurses5 libssl1.0.2 rpi-eeprom-images uuid-dev
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
pi@raspberrypi:~ $

[GarethHards]

pi@raspberrypi:/usbwifi/rtl8821CU $ ls
clean core dkms.conf hal ifcfg-wlan0 include Kconfig LICENSE Makefile os_dep platform README.md rtl8821c.mk runwpa wlan0dhcp
pi@raspberrypi:/usbwifi/rtl8821CU $

[GarethHards]

5.10.11-v8+ is my last folder in lib modules and the one with the issue is the one above