First working version with some test executables

cmake/FindPNG.cmake

@@ -0,0 +1,63 @@
+# - Find the native PNG includes and library
+#
+
+# This module defines
+#  PNG_INCLUDE_DIR, 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.
+# also defined, but not for general use are
+#  PNG_LIBRARY, where to find the PNG library.
+# None of the above will be defined unles zlib can be found.
+# PNG depends on Zlib
+#
+# Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
+# See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
+
+
+INCLUDE(FindZLIB)
+
+SET(PNG_FOUND "NO")
+
+IF(ZLIB_FOUND)
+	FIND_PATH(PNG_PNG_INCLUDE_DIR png.h
+			/usr/local/include
+			/usr/include
+			/usr/local/include/libpng             # OpenBSD
+	)
+
+	SET(PNG_NAMES ${PNG_NAMES} png libpng)
+	FIND_LIBRARY(PNG_LIBRARY
+			NAMES ${PNG_NAMES}
+			PATHS /usr/lib64 /usr/lib /usr/local/lib
+	)
+
+	IF (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR)
+		# png.h includes zlib.h. Sigh.
+		SET(PNG_INCLUDE_DIR ${PNG_PNG_INCLUDE_DIR} ${ZLIB_INCLUDE_DIR} )
+		SET(PNG_LIBRARIES ${PNG_LIBRARY} ${ZLIB_LIBRARY})
+		SET(PNG_FOUND "YES")
+		SET(HAVE_PNG_H)
+		IF (CYGWIN)
+			IF(BUILD_SHARED_LIBS)
+				# No need to define PNG_USE_DLL here, because it's default for Cygwin.
+			ELSE(BUILD_SHARED_LIBS)
+				SET (PNG_DEFINITIONS -DPNG_STATIC)
+			ENDIF(BUILD_SHARED_LIBS)
+		ENDIF (CYGWIN)
+
+	ENDIF (PNG_LIBRARY AND PNG_PNG_INCLUDE_DIR)
+
+ENDIF(ZLIB_FOUND)
+
+IF (PNG_FOUND)
+	IF (NOT PNG_FIND_QUIETLY)
+		MESSAGE(STATUS "Found PNG: ${PNG_LIBRARY}")
+	ENDIF (NOT PNG_FIND_QUIETLY)
+ELSE (PNG_FOUND)
+	IF (PNG_FIND_REQUIRED)
+		MESSAGE(FATAL_ERROR "Could not find PNG library")
+	ENDIF (PNG_FIND_REQUIRED)
+ENDIF (PNG_FOUND)
+
+MARK_AS_ADVANCED(PNG_PNG_INCLUDE_DIR PNG_LIBRARY )