Hello, Today I built a custom kernel in CentOS 5 following the instructions on this page: http://wiki.centos.org/HowTos/Custom_Kernel It's excellent, but I have some remarks I would add: 1. %define buildid .your_identifier In the commented line, there is a space after the % sign. You have to manually remove this space. I think someone was bit by this a short while ago. I think making this explicit on the Wiki would help, since it's not something obvious that is trivial to see and it leads to problems long after that. 2. Section "Configuring your kernel" You actually only have to do the instructions in that section if you want to reconfigure the kernel, but it's not explicitly said so anywhere. For instance, in my case, I only wanted to add a new patch, so I could use the default configuration (at least I believe I could), so there was no need to copy the configurations there, then running make menuconfig, then copying the configurations back, etc. I think this could be made explicit too. 3. How to build based on the CentOS Plus kernel? In my case, I actually wanted to build a custom kernel based on the CentOS Plus kernel, because I wanted XFS support. I just wanted to apply a small patch that adds hardware support for a specific adapter. I could follow the instructions to create a kernel based on the CentOS Plus sources, but many parts of it were not in the CentOS Plus specfile. For example, "with_debug" is already set to 0. The block that starts with "#if a rhel kernel, apply the rhel config options" is not present either, I believe it was already stripped when the CentOS Plus kernel was initially built. I also used Patch400000:, since the latest patch in the CentOS Plus kernel is Patch99999:, so to be safe I included it later. 4. echo "%_topdir %(echo $HOME)/rpmbuild" > .rpmmacros in "I need the Kernel Source" This is a really small one, but the command above will expand $HOME when you actually run the "echo", I believe what you wanted was the command with single quotes, since that will expand the echo every time the "rpm" command is run. Otherwise, if you wanted to put the actual home directory there, you could have just used echo "%_topdir $HOME/rpmbuild" since that would have the same effect without using a shell escape from RPM. Well, as I said, the document is excellent in itself, these are very minor items that I believe could be improved. I volunteer to change the documents to reflect these, in that case, I only need write permission to the Wiki pages. My wiki username is FilipeBrandenburger. Thanks! Filipe