I was able to build plain kernel v4.9. It builds v4.9-rt1 fine too, but fails when I try to install it. console message is run-parts: executing /etc/kernel/postinst.d/dkms 4.9.0-rt1 /boot/vmlinuz-4.9.0-rt1 Error! Bad return status for module build on kernel: 4.9.0-rt1 (x86_64) and there is following in make.log KMS make.log for open-vm-tools-9.4.6 for kernel 4.9.0-rt1 (x86_64) Mon Dec 26 14:09:03 EST 2016 /bin/sh: 1: test: -I./arch/x86/include: unexpected operator Using standalone build system. Makefile:167: Makefile.normal: No such file or directory make[3]: *** No rule to make target 'Makefile.normal'. Stop. /bin/sh: 1: test: -I./arch/x86/include: unexpected operator Using standalone build system. Makefile:167: Makefile.normal: No such file or directory make[3]: *** No rule to make target 'Makefile.normal'. Stop. I'm very new to the linux building process. Please Help -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html