# Try to find the ZLIB libraries
# ZLIB_FOUND - system has ZLIB lib
# ZLIB_INCLUDE_DIR - the ZLIB include directory
# ZLIB_LIBRARIES - the ZLIB libraries
# ZLIB_IN_CGAL_AUXILIARY - TRUE if the ZLIB found is the one distributed with CGAL in the auxiliary folder

# TODO: support MacOSX

include(FindPackageHandleStandardArgs)
include(GeneratorSpecificSettings)

# Is it already configured?
if (ZLIB_INCLUDE_DIR AND ZLIB_LIBRARIES ) 
   
  set(ZLIB_FOUND TRUE)
  
else()  

  # Look first for the ZLIB distributed with CGAL in auxiliary/zlib
  find_path(ZLIB_INCLUDE_DIR 
            NAMES zlib.h 
            PATHS ${CGAL_SOURCE_DIR}/auxiliary/zlib/include
                  ENV ZLIB_INC_DIR
  	        DOC "The directory containing the ZLIB header files"
           )

  if ( ZLIB_INCLUDE_DIR STREQUAL "${CGAL_SOURCE_DIR}/auxiliary/zlib/include" )
    set( ZLIB_IN_CGAL_AUXILIARY TRUE CACHE INTERNAL "" )
  endif()
  
  find_library(ZLIB_LIBRARIES 
               NAMES zlib z zdll
               PATHS ${CGAL_SOURCE_DIR}/auxiliary/zlib/lib
                     ENV ZLIB_LIB_DIR
               DOC "Path to the ZLIB library"
              )
   
  if ( ZLIB_LIBRARIES ) 
    get_filename_component(ZLIB_LIBRARIES_DIR ${ZLIB_LIBRARIES} PATH CACHE)
  endif()
  
  # Attempt to load a user-defined configuration for ZLIB if couldn't be found
  if ( NOT ZLIB_INCLUDE_DIR OR NOT ZLIB_LIBRARIES )
    include( ZLIBConfig OPTIONAL )
  endif()
  
  FIND_PACKAGE_HANDLE_STANDARD_ARGS(ZLIB "DEFAULT_MSG" ZLIB_INCLUDE_DIR ZLIB_LIBRARIES)
  
endif()

mark_as_advanced(ZLIB_INCLUDE_DIR)
mark_as_advanced(ZLIB_LIBRARIES)