zlibは最新版の1.1.4入ってて /etc/ld.so.confにもパス通してあるのに

checking for libz... configure: error: not found.
Possibly configure picks up an outdated version
installed by XFree86. Remove it from your system.
Check your installation and look into config.log

いわれます> kopeteの configure時。
なぜなんでせう。。。