dkms fails on CentOS 7.9 kernel-lt

[NRGadmin]

System information

Type	Version/Name
Distribution Name	Centos
Distribution Version	7.9.2009
Linux Kernel	5.4.127-1.el7.elrepo.x86_64
Architecture	amd64
ZFS Version	2.0.4-1
SPL Version	n/a

Describe the problem you're observing

dkms fails to build the zfs module on both 0.8.6-1 and 2.0.4-1

Loading new zfs-2.0.4 DKMS files...
Building for 5.4.127-1.el7.elrepo.x86_64
Building initial module for 5.4.127-1.el7.elrepo.x86_64
configure: error:
        *** Unable to build an empty module.

scripts/Makefile.clean:15: /var/lib/dkms/zfs/2.0.4/build/Makefile: No such file or directory
make[2]: *** No rule to make target `/var/lib/dkms/zfs/2.0.4/build/Makefile'.  Stop.
make[1]: *** [_clean_/var/lib/dkms/zfs/2.0.4/build] Error 2
make: *** [sub-make] Error 2
Error! Bad return status for module build on kernel: 5.4.127-1.el7.elrepo.x86_64 (x86_64)
Consult /var/lib/dkms/zfs/2.0.4/build/make.log for more information.

# cat /var/lib/dkms/zfs/2.0.4/build/make.log
DKMS make.log for zfs-2.0.4 for kernel 5.4.127-1.el7.elrepo.x86_64 (x86_64)
Tue Jun 22 09:21:52 CDT 2021
make: *** No targets specified and no makefile found.  Stop.

Running ./configure in /var/lib/dkms/zfs/2.0.4/build ends with:

checking kernel source directory... /usr/src/kernels/5.4.127-1.el7.elrepo.x86_64
checking kernel build directory... /usr/src/kernels/5.4.127-1.el7.elrepo.x86_64
checking kernel source version... 5.4.127-1.el7.elrepo.x86_64
checking kernel file name for module symbols... Module.symvers
checking whether modules can be built... no
configure: error:
        *** Unable to build an empty module.

config.log attached.
config.log

Describe how to reproduce the problem

# yum install https://www.elrepo.org/elrepo-release-7.el7.elrepo.noarch.rpm
# yum erase kernel-tools-libs kernel-debug-devel
# /usr/bin/yum -y swap -- erase kernel kernel-devel kernel-headers kernel-tools kernel-tools-lib -- install kernel-lt kernel-lt-devel kernel-lt-headers
# reboot
# yum install https://zfsonlinux.org/epel/zfs-release.el7_9.noarch.rpm
# yum-config-manager --disable zfs
# yum-config-manager --enable zfs-testing
# yum install zfs 

Include any warning/errors/backtraces from the system logs

No system logs.

[rincebrain]

#11745 says hello.

Here's an explanation - tldr these builds of 5.4 and newer need gcc 9 or newer for building against them to do something reasonable, but for whatever ungodly reason elrepo's kernels don't have a dependency marked for this.

[stale]

This issue has been automatically marked as "stale" because it has not had any activity for a while. It will be closed in 90 days if no further activity occurs. Thank you for your contributions.