libc5 5.4.46-15 (i386 binary) in ubuntu warty

The Linux C library version 5 (run-time libraries).
 Includes shared libraries needed to run programs built with libc 5.
 These libraries are modified to make them work better in a libc6
 environment.
 .
 In conjunction with the altgcc package, binaries can be built which
 depend on libc5.
 .
 Please note that libc5 is obsolete and only needed for commercial
 applications. Bugs won't get fixed.