Please read the zlibc documentation (info, html) to learn how to use zlibc.
Basically, all you need to do is:

for sh/bash/ksh/zsh:
  LD_PRELOAD=uncompress.so
  export

for csh/tcsh:
  setenv LD_PRELOAD uncompress.so

FWIW, this source uses arch-independent asm to do the magic.  The source should
compile on any Linux box (of any supported architecture) with a new enough
glibc.