The following content is mainly historical; EGLIBC is no longer maintained or developed except for merges to the remaining active release branches.
You need the tools and patches listed here in order to build EGLIBC.
EGLIBC 2.5 Branch
On some platforms, additional patches are required:
To debug multi-threaded programs linked with EGLIBC, you need a GDB snapshot created after June 27, 2007 or this GDB patch.