libz library missing while installing RMySQL

Hello, Sebastian.

  It looks like you are also missing MySQL API installed.
  It consists of several C headers and libraries with definitions of
  functions, working with mysql server daemon.

  In your case rackage installation process needs to compile some C sources, and
  a compiler must know where to take function definitions from.

--
Best regards
Wladimir Eremeev                                     mailto:wl at eimb.ru

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Research Scientist, PhD                           Leninsky Prospect 33,
Space Monitoring & Ecoinformation Systems Sector, Moscow, Russia, 119071,
Institute of Ecology,                             Phone: (095) 135-9972;
Russian Academy of Sciences                       Fax: (095) 135-9972