--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -84,7 +84,7 @@ macro(opencollada_add_lib
 			message(${name} " WARNING: Shared library support implemented for UNIX-like OS only")
 		endif ()
 		add_library(${name}_shared SHARED ${sources})
-		set_target_properties(${name}_shared PROPERTIES OUTPUT_NAME ${name})
+		set_target_properties(${name}_shared PROPERTIES OUTPUT_NAME ${name} SOVERSION ${soversion})
 		foreach(target_lib ${target_libs})
 			if(TARGET ${target_lib}_shared)
 				target_link_libraries(${name}_shared ${target_lib}_shared)
@@ -190,8 +190,8 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}
 #-----------------------------------------------------------------------------
 # Install vars
 
-set(OPENCOLLADA_INST_INCLUDE ${CMAKE_INSTALL_PREFIX}/include/opencollada)
-set(OPENCOLLADA_INST_LIBRARY ${CMAKE_INSTALL_PREFIX}/lib/opencollada)
+set(OPENCOLLADA_INST_INCLUDE ${INCLUDE_INSTALL_DIR})
+set(OPENCOLLADA_INST_LIBRARY ${LIB_INSTALL_DIR})
 set(OPENCOLLADA_INST_CMAKECONFIG ${OPENCOLLADA_INST_LIBRARY}/cmake)
 
 
@@ -274,7 +274,10 @@ add_subdirectory(common/libftoa)
 add_subdirectory(${EXTERNAL_LIBRARIES}/UTF)
 add_subdirectory(common/libBuffer)
 add_subdirectory(${EXTERNAL_LIBRARIES}/MathMLSolver)
-add_subdirectory(${EXTERNAL_LIBRARIES}/zlib)
+#add_subdirectory(${EXTERNAL_LIBRARIES}/zlib)
+pkg_check_modules(ZLIB REQUIRED zlib)
+message(STATUS "zlib libraries: ${ZLIB_LIBRARIES}")
+set(zlib_shared ${ZLIB_LIBRARIES})
 
 # building OpenCOLLADA libs
 add_subdirectory(COLLADABaseUtils)
--- a/DAEValidator/CMakeLists.txt
+++ b/DAEValidator/CMakeLists.txt
@@ -83,7 +83,7 @@ endif ()
 if (USE_STATIC)
         list(APPEND Libraries zlib_static)
     else ()
-        list(APPEND Libraries zlib_shared)
+        list(APPEND Libraries ${zlib_shared})
     endif ()
 if (WIN32)
 	list(APPEND Libraries ws2_32.lib)
@@ -158,7 +158,7 @@ if (WIN32 AND ${CMAKE_MAJOR_VERSION}.${C
 	if (USE_STATIC)
 		list(APPEND Libraries xml_static zlib_static)
 	else ()
-		list(APPEND Libraries xml_shared zlib_shared)
+		list(APPEND Libraries xml_shared ${zlib_shared})
 	endif ()
 	if (WIN32)
 		list(APPEND Libraries ws2_32.lib)
@@ -211,7 +211,4 @@ endif ()
 # zlib
 if (USE_STATIC)
 	add_dependencies(DAEValidatorExecutable zlib_static)
-else ()
-	add_dependencies(DAEValidatorExecutable zlib_shared)
 endif ()
-include_directories("../Externals/zlib/include")