Dependency issue: make > make: *** [Makefile:43: v4l2loopback.ko] Error 2

[DominikAgejev]

• v4l2loopback version: 0.12.5 I believe

    sudo dmesg  | grep -i v4l2loopback
  

• kernel version: 5.4.0-47-generic

• Distribution (+version): Ubuntu 20.04.1 LTS

Please keep in mind I switched to linux a few days ago and am not familiar with it. Thank you for your patience

I am trying to install v4l2loopback for use as a virtual camera with OBS and the CatxFish plugin.

Here are my steps.

First check linux headers with:

$ ls -l /usr/src/linux-headers-$(uname -r)

Output:

total 1608
drwxr-xr-x 3 root root    4096 ruj   9 19:43 arch
lrwxrwxrwx 1 root root      31 ruj   4 21:08 block -> ../linux-headers-5.4.0-47/block
lrwxrwxrwx 1 root root      31 ruj   4 21:08 certs -> ../linux-headers-5.4.0-47/certs
lrwxrwxrwx 1 root root      32 ruj   4 21:08 crypto -> ../linux-headers-5.4.0-47/crypto
lrwxrwxrwx 1 root root      39 ruj   4 21:08 Documentation -> ../linux-headers-5.4.0-47/Documentation
lrwxrwxrwx 1 root root      33 ruj   4 21:08 drivers -> ../linux-headers-5.4.0-47/drivers
lrwxrwxrwx 1 root root      28 ruj   4 21:08 fs -> ../linux-headers-5.4.0-47/fs
drwxr-xr-x 4 root root    4096 ruj   9 19:43 include
lrwxrwxrwx 1 root root      30 ruj   4 21:08 init -> ../linux-headers-5.4.0-47/init
lrwxrwxrwx 1 root root      29 ruj   4 21:08 ipc -> ../linux-headers-5.4.0-47/ipc
lrwxrwxrwx 1 root root      32 ruj   4 21:08 Kbuild -> ../linux-headers-5.4.0-47/Kbuild
lrwxrwxrwx 1 root root      33 ruj   4 21:08 Kconfig -> ../linux-headers-5.4.0-47/Kconfig
drwxr-xr-x 2 root root    4096 ruj   9 19:43 kernel
lrwxrwxrwx 1 root root      29 ruj   4 21:08 lib -> ../linux-headers-5.4.0-47/lib
lrwxrwxrwx 1 root root      34 ruj   4 21:08 Makefile -> ../linux-headers-5.4.0-47/Makefile
lrwxrwxrwx 1 root root      28 ruj   4 21:08 mm -> ../linux-headers-5.4.0-47/mm
-rw-r--r-- 1 root root 1616765 ruj   4 21:08 Module.symvers
lrwxrwxrwx 1 root root      29 ruj   4 21:08 net -> ../linux-headers-5.4.0-47/net
lrwxrwxrwx 1 root root      33 ruj   4 21:08 samples -> ../linux-headers-5.4.0-47/samples
drwxr-xr-x 7 root root   12288 ruj   9 19:43 scripts
lrwxrwxrwx 1 root root      34 ruj   4 21:08 security -> ../linux-headers-5.4.0-47/security
lrwxrwxrwx 1 root root      31 ruj   4 21:08 sound -> ../linux-headers-5.4.0-47/sound
drwxr-xr-x 3 root root    4096 ruj   9 19:43 tools
lrwxrwxrwx 1 root root      32 ruj   4 21:08 ubuntu -> ../linux-headers-5.4.0-47/ubuntu
lrwxrwxrwx 1 root root      29 ruj   4 21:08 usr -> ../linux-headers-5.4.0-47/usr
lrwxrwxrwx 1 root root      30 ruj   4 21:08 virt -> ../linux-headers-5.4.0-47/virt

I attempt the install process which results in an error I don't understand.

dominik@dominik-UX430UAR:~$ cd v4l2loopback/
dominik@dominik-UX430UAR:~/v4l2loopback$ make && sudo make install
Building v4l2-loopback driver...
make -C /lib/modules/`uname -r`/build M=/home/dominik/v4l2loopback modules
make[1]: Entering directory '/usr/src/linux-headers-5.4.0-47-generic'
arch/x86/Makefile:147: CONFIG_X86_X32 enabled but no binutils support
make[1]: gcc: Command not found
  CC [M]  /home/dominik/v4l2loopback/v4l2loopback.o
/bin/sh: 1: gcc: not found
make[2]: *** [scripts/Makefile.build:275: /home/dominik/v4l2loopback/v4l2loopback.o] Error 127
make[1]: *** [Makefile:1734: /home/dominik/v4l2loopback] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.4.0-47-generic'
make: *** [Makefile:43: v4l2loopback.ko] Error 2

Trying to run fails as expected:

dominik@dominik-UX430UAR:~/v4l2loopback$ sudo modprobe v4l2loopback
[sudo] password for dominik: 
modprobe: FATAL: Module v4l2loopback not found in directory /lib/modules/5.4.0-47-generic

I researched a bit and haven't found a solution, if you could help me I'd appreciate it. I assume the problem is in the headers of the kernel and dependency not matching but I don't know what that entails or how to fix it.

I've read #340 and don't see how it could help me.
Same with this: #238

[umlaeute]

the key-error is:

make[1]: gcc: Command not found

as described in the first paragraph of the Dependency section in the README you really must have a working build-system (including a compiler)