added debug message in cmake

scripts/install.cmake

@@ -139,7 +139,8 @@ if(NOT SKIP_PLUGINVAL)
         if(NOT EXISTS ${PLUGINVAL_TEMP_ZIP_PATH})
             file(DOWNLOAD ${PLUGINVAL_DOWNLOAD_URL} ${PLUGINVAL_TEMP_ZIP_PATH})
         endif(NOT EXISTS ${PLUGINVAL_TEMP_ZIP_PATH})
-        execute_process(COMMAND ${CMAKE_COMMAND} -E tar -xf ${PLUGINVAL_TEMP_ZIP_PATH} WORKING_DIRECTORY ${BUILD_DIR})
+        execute_process(COMMAND ${CMAKE_COMMAND} -E tar -xf ${PLUGINVAL_TEMP_ZIP_PATH} RESULT_VARIABLE OUTVAR WORKING_DIRECTORY ${BUILD_DIR})
+        message("${OUTVAR}")
     endif(NOT EXISTS  ${PLUGINVAL_EXE_PATH})
     xinstall(INSTALL_PREFIX ${PLUGINVAL_INSTALL_PREFIX} DESTINATION bin/  FILE_PATTERNS ${PLUGINVAL_EXE_PATH})
 endif(NOT SKIP_PLUGINVAL)