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Edit File: FindPNG.cmake

# - Find the native PNG includes and library
#
# This module searches libpng, the library for working with PNG images.
#
# It defines the following variables
#  PNG_INCLUDE_DIRS, where to find png.h, etc.
#  PNG_LIBRARIES, the libraries to link against to use PNG.
#  PNG_DEFINITIONS - You should add_definitons(${PNG_DEFINITIONS}) before compiling code that includes png library files.
#  PNG_FOUND, If false, do not try to use PNG.
#  PNG_VERSION_STRING - the version of the PNG library found (since CMake 2.8.8)
# Also defined, but not for general use are
#  PNG_LIBRARY, where to find the PNG library.
# For backward compatiblity the variable PNG_INCLUDE_DIR is also set. It has the same value as PNG_INCLUDE_DIRS.
#
# Since PNG depends on the ZLib compression library, none of the above will be
# defined unless ZLib can be found.

#=============================================================================
# Copyright 2002-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)

if(PNG_FIND_QUIETLY)
  set(_FIND_ZLIB_ARG QUIET)
endif()
find_package(ZLIB ${_FIND_ZLIB_ARG})

if(ZLIB_FOUND)
  find_path(PNG_PNG_INCLUDE_DIR png.h
  /usr/local/include/libpng             # OpenBSD
  )

list(APPEND PNG_NAMES png libpng)
  unset(PNG_NAMES_DEBUG)
  set(_PNG_VERSION_SUFFIXES 17 16 15 14 12)
  if (PNG_FIND_VERSION MATCHES "^[0-9]+\\.[0-9]+(\\..*)?$")
    string(REGEX REPLACE
        "^([0-9]+)\\.([0-9]+).*" "\\1\\2"
        _PNG_VERSION_SUFFIX_MIN "${PNG_FIND_VERSION}")
    if (PNG_FIND_VERSION_EXACT)
      set(_PNG_VERSION_SUFFIXES ${_PNG_VERSION_SUFFIX_MIN})
    else ()
      string(REGEX REPLACE
          "${_PNG_VERSION_SUFFIX_MIN}.*" "${_PNG_VERSION_SUFFIX_MIN}"
          _PNG_VERSION_SUFFIXES "${_PNG_VERSION_SUFFIXES}")
    endif ()
    unset(_PNG_VERSION_SUFFIX_MIN)
  endif ()
  foreach(v IN LISTS _PNG_VERSION_SUFFIXES)
    list(APPEND PNG_NAMES png${v} libpng${v})
    list(APPEND PNG_NAMES_DEBUG png${v}d libpng${v}d)
  endforeach()
  unset(_PNG_VERSION_SUFFIXES)
  # For compatiblity with versions prior to this multi-config search, honor
  # any PNG_LIBRARY that is already specified and skip the search.
  if(NOT PNG_LIBRARY)
    find_library(PNG_LIBRARY_RELEASE NAMES ${PNG_NAMES})
    find_library(PNG_LIBRARY_DEBUG NAMES ${PNG_NAMES_DEBUG})
    include(${CMAKE_CURRENT_LIST_DIR}/SelectLibraryConfigurations.cmake)
    select_library_configurations(PNG)
    mark_as_advanced(PNG_LIBRARY_RELEASE PNG_LIBRARY_DEBUG)
  endif()
  unset(PNG_NAMES)
  unset(PNG_NAMES_DEBUG)

# Set by select_library_configurations(), but we want the one from
  # find_package_handle_standard_args() below.
  unset(PNG_FOUND)

if (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR)
      # png.h includes zlib.h. Sigh.
      set(PNG_INCLUDE_DIRS ${PNG_PNG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} )
      set(PNG_INCLUDE_DIR ${PNG_INCLUDE_DIRS} ) # for backward compatiblity
      set(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})

if (CYGWIN)
        if(BUILD_SHARED_LIBS)
           # No need to define PNG_USE_DLL here, because it's default for Cygwin.
        else()
          set (PNG_DEFINITIONS -DPNG_STATIC)
        endif()
      endif ()

endif ()

if (PNG_PNG_INCLUDE_DIR AND EXISTS "${PNG_PNG_INCLUDE_DIR}/png.h")
      file(STRINGS "${PNG_PNG_INCLUDE_DIR}/png.h" png_version_str REGEX "^#define[ \t]+PNG_LIBPNG_VER_STRING[ \t]+\".+\"")

string(REGEX REPLACE "^#define[ \t]+PNG_LIBPNG_VER_STRING[ \t]+\"([^\"]+)\".*" "\\1" PNG_VERSION_STRING "${png_version_str}")
      unset(png_version_str)
  endif ()
endif()

# handle the QUIETLY and REQUIRED arguments and set PNG_FOUND to TRUE if
# all listed variables are TRUE
include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(PNG
                                  REQUIRED_VARS PNG_LIBRARY PNG_PNG_INCLUDE_DIR
                                  VERSION_VAR PNG_VERSION_STRING)

mark_as_advanced(PNG_PNG_INCLUDE_DIR PNG_LIBRARY )