The 'linux-headers' (or 'kernel-headers') used in a Linux distro are critical, they determine the oldest kernel that can be used with that distro.
The Linux headers are at /usr/include/linux (when Puppy's 'devx' SFS is loaded).
When the 'glibc' package is compiled, it looks into /usr/include/linux to determine kernel capabilities.
This is critical. The Puppy 4.x series uses linux-headers 2.6.19 -- this means that Puppy 4.x will work properly with any kernel 2.6.19 or later.
The T2 packages compiled for Quirky used linux-headers 2.6.30. Ubuntu Lucid Lynx uses linux-headers 2.6.33.
Right now I'm running Wary with 22.214.171.124 kernel, built with the same T2 packages as used for Quirky, and it seems to be working ok. Really though, I should recompile all the base packages in T2, against the 2.6.27 headers.
...which is what I started to do. That is, compiling in T2 with linux-headers 2.6.27, kernel 2.6.30 .... but then a few minutes ago I read this:
As explained above, user-space uses linux-headers. /usr/src/linux is used for building kernel modules. To give examples, x11-drivers/ati-drivers and app-emulation/vmware-modules use /usr/src/linux (kernel sources package), while media-libs/alsa-lib and sys-libs/glibc would use /usr/include/linux (linux-headers package).
...yes, some Xorg drivers look into /usr/src/linux.
So, just now I have aborted the T2 compile, and will restart it using linux-headers 2.6.27 and kernel 2.6.27.
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