patch to use system's zlib when enabled by the CMake option USE_SYSTEM_ZLIB

neo/CMakeLists.txt

@@ -21,6 +21,9 @@ option(FFMPEG
 option(ONATIVE
 		"Optimize for the host CPU" OFF)
 
+option(USE_SYSTEM_ZLIB
+                "Use the system zlib instead of the bundled one" OFF)
+
 if(UNIX)
 	set(OPENAL TRUE)
 endif()
@@ -179,6 +182,18 @@ endif()
 #	add_definitions(-DSTANDALONE)
 #endif()
 
+if (USE_SYSTEM_ZLIB)
+  find_package(ZLIB REQUIRED)
+endif(USE_SYSTEM_ZLIB)
+
+if (ZLIB_FOUND)
+    include_directories(${ZLIB_INCLUDE_DIRS})
+    set(ZLIB_LIBRARY ${ZLIB_LIBRARIES})
+else (ZLIB_FOUND)
+    include_directories("libs/zlib")
+    set(ZLIB_LIBRARY "" )
+endif (ZLIB_FOUND)
+
 add_subdirectory(idlib)
 
 file(GLOB AAS_INCLUDES aas/*.h)
@@ -379,8 +394,14 @@ set(JPEG_SOURCES
 file(GLOB PNG_INCLUDES libs/png/*.h)
 file(GLOB PNG_SOURCES libs/png/*.c)
 
+if (NOT ZLIB_FOUND)
 file(GLOB ZLIB_INCLUDES libs/zlib/*.h)
 file(GLOB ZLIB_SOURCES libs/zlib/*.c)
+else (NOT ZLIB_FOUND)
+  set(ZLIB_INCLUDES "")
+  set(ZLIB_SOURCES "")
+endif (NOT ZLIB_FOUND)
+
 
 file(GLOB MINIZIP_INCLUDES libs/zlib/minizip/*.h)
 file(GLOB MINIZIP_SOURCES libs/zlib/minizip/*.c libs/zlib/minizip/*.cpp)
@@ -1134,7 +1155,7 @@ include_directories(
 			#libs/openal/include
 			libs/glew/include
 			#libs/freetype/include
-			libs/zlib)
+            )
 			
 #link_directories(
 #			${CMAKE_CURRENT_SOURCE_DIR}/libs/curl/lib
@@ -1312,6 +1333,7 @@ if(MSVC)
 		wsock32.lib
 		${OpenAL_LIBRARIES}
 		${FFmpeg_LIBRARIES}
+        ${ZLIB_LIBRARY}
 		)
 		
 	#CMAKE_BINARY_DIR
@@ -1473,6 +1495,7 @@ else()
 			${SDLx_LIBRARY}
 			${OPENAL_LIBRARY}
 			${FFMPEG_LIBRARIES}
+            ${ZLIB_LIBRARY}
 			)
 	endif()
     

neo/framework/File_SaveGame.h

@@ -28,7 +28,7 @@ If you have questions concerning this license or the applicable additional terms
 #ifndef __FILE_SAVEGAME_H__
 #define __FILE_SAVEGAME_H__
 
-#include "../libs/zlib/zlib.h"
+#include <zlib.h>
 
 // Listing of the types of files within a savegame package
 enum saveGameType_t

neo/framework/Zip.h

@@ -28,10 +28,10 @@ If you have questions concerning this license or the applicable additional terms
 #ifndef	__ZIP_H__
 #define	__ZIP_H__
 
-#include "../libs/zlib/zlib.h"
+#include <zlib.h>
 
 // DG: all the zip access stuff from minizip is now in minizip/zip.h
-#include "minizip/zip.h"
+#include "libs/zlib/minizip/zip.h"
 
 
 /*

neo/swf/SWF_Zlib.cpp

@@ -27,7 +27,7 @@ If you have questions concerning this license or the applicable additional terms
 */
 #pragma hdrstop
 #include "precompiled.h"
-#include "../libs/zlib/zlib.h"
+#include <zlib.h>
 
 /*
 ========================