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Andreas Tscharner committed 8a7d7e6

Updated prerequisites

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 }}}
 
 ==== Prerequisites ====
-{{{lrc}}} needs gcc in version **4.6**, because it uses some features from the new //C++0x// standard
+{{{lrc}}} needs the follwing programs or libraries on the system:
+* gcc in version **4.6**, because it uses some features from the new //C++0x// standard
+* zlib for the zlib compression (it is also needed, if the zLib compression is not used, because it is compiled unconditionally)
+* The //ShowImage// example program needs SDL and SDL_image. If one or both of these libraries are not installed, the example program won't be built
 
 ==== Code documentation ====
 If [[http://www.doxygen.org|Doxygen]] is installed on the system, a HTML code documentation will be created in the {{{doc\}}} directory.
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