Hi there, I want tu use my Raspberry Pi 4 as a timeserver. I have a USB Clock from Meinberg and want to compile mbgtools-lx-4.2.8. While compiling with make: Calling kernel build system to make “modules” ERROR: Kernel configuration is invalid. include/generated/autoconf.h or include/config/auto.conf are missing. Run ‘make oldconfig && make prepare’ on kernel src to fix it. make[2]: *** [Makefile:720: include/config/auto.conf] Fehler 1 make[1]: *** [/root/mbgtools-lx-4.2.8/mbgclock/…/Makefile:804: modules] Fehler 2 make: *** [Makefile:336: mbgclock] Fehler 2 [root@raspi4 mbgtools-lx-4.2.8]# How to solve this error? [root@raspi4 mbgtools-lx-4.2.8]# rpm -qa | grep kernel | sort kernel-headers-4.18.0-348.7.1.el8_5.aarch64 kernel-tools-4.18.0-348.7.1.el8_5.aarch64 kernel-tools-libs-4.18.0-348.7.1.el8_5.aarch64 raspberrypi2-kernel4-5.10.78-v8.1.el8.aarch64 raspberrypi2-kernel4-devel-5.10.78-v8.1.el8.aarch64 [root@raspi4 mbgtools-lx-4.2.8]# cat /etc/almalinux-release AlmaLinux release 8.5 (Arctic Sphynx) [root@raspi4 mbgtools-lx-4.2.8]# Thanks Andreas