- prevent the fetch of openfst
- workaround for https://github.com/kaldi-asr/kaldi/issues/4892 (use of C++17 feature while compiling in the C++14 mode)

--- CMakeLists.txt.orig	2023-11-13 04:13:54 UTC
+++ CMakeLists.txt
@@ -22,7 +22,7 @@ endif()
 
 include(third_party/get_third_party)
 
-include(cmake/third_party/openfst.cmake)
+#include(cmake/third_party/openfst.cmake)
 
 find_package(PythonInterp)
 if(NOT PYTHON_EXECUTABLE)
@@ -43,7 +43,7 @@ execute_process(COMMAND ${PYTHON_EXECUTABLE}
 )
 unset(IS_LIB_SHARE)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_INSTALL_MESSAGE LAZY) # hide "-- Up-to-date: ..."
 if(BUILD_SHARED_LIBS)