Unable to build glibc without nptl (Native Posix Thread Libary).
When building glibc, answering 'no' to the following causes the build to fail.
As you are running a 2.6 kernel, would you like to use the new nptl (Native Posix Thread Libary)? [n]
The result is:
sed: can't read /usr/src/glibc-2.3.6/kernel-headers/include/Kbuild: No such file or directory
from the PRE_BUILD script.