Don't know why I don't receive mails when the bug has replies, but happily
I kept the tab open :-)
Here is the content of the requested file:
/var/lib/dkms/v4l2loopback/0.15.0/build/make.log
DKMS (dkms-3.2.2) make.log for v4l2loopback/0.15.0 for kernel
6.18.9+deb13-amd64 (x86_64)
dim. 01 mars 2026 09:11:44 CET
Building module(s)
# command: make -j20 KERNELRELEASE=6.18.9+deb13-amd64
KERNEL_DIR=/lib/modules/6.18.9+deb13-amd64/build v4l2loopback
++++++ To sign the module, you must set KBUILD_SIGN_KEY/KBUILD_SIGN_CERT
to point to the signing key/certificate!
++++++ For your convenience, we try to read these variables as
'mok_signing_key' resp. 'mok_certificate' from /etc/dkms/framework.conf
/etc/dkms/framework.conf.d/*.conf
++++++ If your certificate requires a password, pass it via the
KBUILD_SIGN_PIN env-var!
++++++ E.g. using 'export KBUILD_SIGN_PIN; read -s -p "Passphrase for
signing key : " KBUILD_SIGN_PIN; sudo --preserve-env=KBUILD_SIGN_PIN make
sign'
Building v4l2-loopback driver...
make -C /lib/modules/6.18.9+deb13-amd64/build
M=/var/lib/dkms/v4l2loopback/0.15.0/build KCPPFLAGS="" modules
make[1]: Entering directory '/usr/src/linux-headers-6.18.9+deb13-amd64'
make[2]: Entering directory '/var/lib/dkms/v4l2loopback/0.15.0/build'
CC [M] v4l2loopback.o
v4l2loopback.c: In function ‘v4l2_loopback_open’:
v4l2loopback.c:2337:9: error: too few arguments to function ‘v4l2_fh_add’
2337 | v4l2_fh_add(&opener->fh);
| ^~~~~~~~~~~
In file included from
/usr/src/linux-headers-6.18.9+deb13-common/include/media/v4l2-subdev.h:17,
from
/usr/src/linux-headers-6.18.9+deb13-common/include/media/v4l2-device.h:13,
from v4l2loopback.c:29:
/usr/src/linux-headers-6.18.9+deb13-common/include/media/v4l2-fh.h:97:6:
note: declared here
97 | void v4l2_fh_add(struct v4l2_fh *fh, struct file *filp);
| ^~~~~~~~~~~
v4l2loopback.c: In function ‘v4l2_loopback_close’:
v4l2loopback.c:2386:9: error: too few arguments to function ‘v4l2_fh_del’
2386 | v4l2_fh_del(&opener->fh);
| ^~~~~~~~~~~
/usr/src/linux-headers-6.18.9+deb13-common/include/media/v4l2-fh.h:125:6:
note: declared here
125 | void v4l2_fh_del(struct v4l2_fh *fh, struct file *filp);
| ^~~~~~~~~~~
v4l2loopback.c: In function ‘v4l2_loopback_add’:
v4l2loopback.c:2904:9: error: implicit declaration of function
‘setup_timer’ [-Wimplicit-function-declaration]
2904 | setup_timer(&dev->sustain_timer, sustain_timer_clb, nr);
| ^~~~~~~~~~~
make[4]: ***
[/usr/src/linux-headers-6.18.9+deb13-common/scripts/Makefile.build:292:
v4l2loopback.o] Error 1
make[3]: *** [/usr/src/linux-headers-6.18.9+deb13-common/Makefile:2035: .]
Error 2
make[2]: *** [/usr/src/linux-headers-6.18.9+deb13-common/Makefile:260:
__sub-make] Error 2
make[2]: Leaving directory '/var/lib/dkms/v4l2loopback/0.15.0/build'
make[1]: *** [/usr/src/linux-headers-6.18.9+deb13-common/Makefile:260:
__sub-make] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-6.18.9+deb13-amd64'
make: *** [Makefile:53: v4l2loopback.ko] Error 2
# exit code: 2
# elapsed time: 00:00:01
----------------------------------------------------------------
Thank you,
--
*Cyril ADRIAN*
https://www.cadrian.fr
