Add custom CMake function to check for Python module

CMakeLists.txt

@@ -33,6 +33,10 @@ endif(MapServer_IS_DEV_VERSION)
 MATH(EXPR MapServer_VERSION_NUM "${MapServer_VERSION_MAJOR}*10000+${MapServer_VERSION_MINOR}*100+${MapServer_VERSION_REVISION}")
 
 SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
+
+# Add custom function to check Python modules are installed
+include(FindPythonModule)
+
 if (APPLE)
   set(CMAKE_FIND_FRAMEWORK "LAST")
 endif (APPLE)

cmake/FindPythonModule.cmake

@@ -0,0 +1,24 @@
+# Find if a Python module is installed
+# Found at http://www.cmake.org/pipermail/cmake/2011-January/041666.html
+# To use do: find_python_module(PyQt4 REQUIRED)
+function(find_python_module module)
+	string(TOUPPER ${module} module_upper)
+	if(NOT PY_${module_upper})
+		if(ARGC GREATER 1 AND ARGV1 STREQUAL "REQUIRED")
+			set(${module}_FIND_REQUIRED TRUE)
+		endif()
+		# A module's location is usually a directory, but for binary modules
+		# it's a .so file.
+		execute_process(COMMAND "${PYTHON_EXECUTABLE}" "-c" 
+			"import re, ${module}; print(re.compile('/__init__.py.*').sub('',${module}.__file__))"
+			RESULT_VARIABLE _${module}_status 
+			OUTPUT_VARIABLE _${module}_location
+			ERROR_QUIET 
+			OUTPUT_STRIP_TRAILING_WHITESPACE)
+		if(NOT _${module}_status)
+			set(PY_${module_upper} ${_${module}_location} CACHE STRING 
+				"Location of Python module ${module}")
+		endif(NOT _${module}_status)
+	endif(NOT PY_${module_upper})
+	find_package_handle_standard_args(PY_${module} DEFAULT_MSG PY_${module_upper})
+endfunction(find_python_module)

mapscript/python/CMakeLists.txt

@@ -1,6 +1,7 @@
 find_package(SWIG REQUIRED)
 include(${SWIG_USE_FILE})
 find_package(PythonInterp)
+find_python_module(setuptools REQUIRED)
 
 # Python library/header finding doesn't seem to honor the python
 # interpreter that was found beforehand, and defaults to the system