check here https://unix.stackexchange.com/questions/442571/netlink-gnel-id-generate-definition-removed-from-rhel7-5-kernel-library

Hi Erik, Thank you so much for your help so far. I'm in a more complex situation: our kernel module will need to support different version and distribution of Linux. At beginning, we have the compiler operation: #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,30) to define what we do with genl_register_family..., and it is would be logical to add a && (LINUX_VERSION_CODE < KERNEL_VERSION(3,12,0)). But the recent Kernel update /RHEL update make this changed from 7.4 (3.10.0-693) and 7.5 (3.10.0-862). How can I check the kernel build number (-693 v.s. -862) with pre-compile operation? – Weishan Yang May 14 '18 at 7:54
Hi Erik, just to update you in short, the information you've provided is what I'm looking for, and has resolved my problem. For the moment, I use the RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(7,5) to deal with the mass of versioning, and it would work for now. Thank you so much for your help! – Weishan Yang May 14 '18 at 11:13

if you really need to make it workable on 3.10-rh kernel, you can change related #ifdefs in the code

I've installed on a VM with kernel 5 from elrepo but it didn't work.

did you install related kernel headers?

I did.

Which exactly kernel version was installed?

I installed it.

Thnaks for supporting

My trouble was kernel headers

great. btw, centos8 is available for a long time so if it's a new installation, centos8 will be better

And modules building with default kernel on centos 8

I installed the 4.4.219-1.el7.elrepo.x86_64 kernel version from kernel-lt

That installation is new. Maybe it's better do I install on centos 8?

yes, centos8 is preferable

Let me ask you another question. Which distro would be recommended for installation either debian or centos?

most community members use debian

it's more popular due to centos delays

(rhel - centos delays I mean)

debian has shorter support period