Squashed 'cmake/' content from commit 2d25566

git-subtree-dir: cmake
git-subtree-split: 2d25566a1c5162ce3fd6bfc268d5665de182af89

CheckVersion.cmake

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+# - Utility function for Find modules considering multiple possible versions
+#
+# Requires these CMake modules:
+#  no additional modules required
+#
+# Original Author:
+# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
+# http://academic.cleardefinition.com
+# Iowa State University HCI Graduate Program/VRAC
+#
+#          Copyright Iowa State University 2009-2010
+# Distributed under the Boost Software License, Version 1.0.
+#    (See accompanying file LICENSE_1_0.txt or copy at
+#          http://www.boost.org/LICENSE_1_0.txt)
+
+if(__check_version)
+	return()
+endif()
+set(__check_version YES)
+
+function(check_version var packagename version)
+	# By default, we say that the version is good enough
+	set(_result TRUE)
+
+	# Was a version requested?  If so, what is our test condition?
+	if(${packagename}_FIND_VERSION)
+		if(${packagename}_FIND_VERSION_EXACT)
+			# Yes, an exact == version was requested - check it.
+
+			if(NOT "${version}" VERSION_EQUAL "${${packagename}_FIND_VERSION}")
+				# version is not an exact match
+				set(_result FALSE)
+			endif()
+		else()
+			# Yes, a minimum >= version was requested - check it.
+
+			if("${version}" VERSION_LESS "${${packagename}_FIND_VERSION}")
+				# version is lower than requested
+				set(_result FALSE)
+			endif()
+
+		endif()
+	endif()
+
+	# Return _result
+	set(${var} ${_result} PARENT_SCOPE)
+endfunction()