[trunk] use the home made macro to ensure the existence of some include file

cmake/EnsureFileInclude.cmake

@@ -0,0 +1,26 @@
+# Ensure that an include file is provided by the system
+# Add the check about the mandatory status to the check_include_file macro 
+# provided by cmake
+
+include (${CMAKE_ROOT}/Modules/CheckIncludeFile.cmake)
+
+macro(ensure_file_include INCLUDE_FILENAME VARIABLE_NAME MANDATORY_STATUS)
+
+#message(WARNING "INCLUDE_FILENAME=${INCLUDE_FILENAME} \n"
+#                "VARIABLE_NAME=${VARIABLE_NAME} \n"
+#                "MANDATORY_STATUS=${MANDATORY_STATUS}")
+
+CHECK_INCLUDE_FILE(${INCLUDE_FILENAME} ${VARIABLE_NAME})
+
+#message(WARNING "INCLUDE_FILENAME=${INCLUDE_FILENAME} \n"
+#                "VARIABLE_NAME=${VARIABLE_NAME} \n"
+#                "VARIABLE_NAME_VALUE=${${VARIABLE_NAME}} \n"
+#                "MANDATORY_STATUS=${MANDATORY_STATUS}")
+
+if (NOT ${${VARIABLE_NAME}})
+  if (${MANDATORY_STATUS})
+    message(FATAL_ERROR "The file ${INCLUDE_FILENAME} is mandatory but not found on your system")
+  endif()
+endif()
+
+endmacro()