When I install a XR driver on NanoPi Duo2 using the command " make ", I got the following error message: 10:09 root@G2:XR21B1411-RS-485-driver# make make -C /lib/modules/4.14.111/build M=/root/C/XR21B1411-RS-485-driver make[1]: *** /lib/modules/4.14.111/build: No such file or directory. St...

I have the same issue! My current link for /lib/modules/4.14.111/build is exactly like yours and there is no kernel header for 4.14.111 in my system as well. From googling other people's posts, I think I should expect the correct link to be something like "/lib/modules/4.14.111/build -> /usr/sr...