Hello, I followed the instructions in http://www.mjmwired.net/resources/mjm-fedora-fc6.html#kernelsrc for installing and builing kernel source for Fodora Core 6 on x86_64. I did my actions as a root and not as a user. I download kernel-2.6.18-1.2798.fc6.src.rpm I ran : rpm -ivh kernel-2.6.18-1.2798.fc6.src.rpm then : rpmbuild -bp --target=x86_64 kernel-2.6.spec Building target platforms: x86_64 Building for target x86_64 error: Failed build dependencies: unifdef is needed by kernel-2.6.18-1.2798.x86_64 and I have nothing in /usr/src/redhat/BUILD/ googling for this error gave only 1 hit: http://www.t2-project.org/irclogs/t2-2006-10-17 and it did not help much. Any idea what could it be ? did anyone tried and had success with it ? Regards, IB