[llvm-dev] Fail to install llvm/clang on debian

[Bo YU via llvm-dev]

Hello,
	Maybe this is not a bugs. But i fail to install llvm many times and different machine(debian os).
	First, i follow the instruction:

	http://cilium.readthedocs.io/en/latest/bpf/#llvm

	But during in compiling, i alway get:
	...
	/home/yubo/git/llvm/tools/clang/lib/Basic/VirtualFileSystem.cpp: In member function ‘virtual llvm::ErrorOr<std::unique_ptr<clang::vfs::File> > {anonymous}::RealFileSystem::openFileForRead(const llvm::Twine&)’:
	/home/yubo/git/llvm/tools/clang/lib/Basic/VirtualFileSystem.cpp:262:46: error: ‘OF_None’ is not a member of ‘llvm::sys::fs’ sys::fs::openFileForRead(Name, FD, sys::fs::OF_None, &RealName))


	[ 75%] Building CXX object tools/clang/lib/Rewrite/CMakeFiles/clangRewrite.dir/HTMLRewrite.cpp.o
	tools/clang/lib/Basic/CMakeFiles/clangBasic.dir/build.make:1244: recipe for target 'tools/clang/lib/Basic/CMakeFiles/clangBasic.dir/VirtualFileSystem.cpp.o' failed
	make[2]: *** [tools/clang/lib/Basic/CMakeFiles/clangBasic.dir/VirtualFileSystem.cpp.o] Error 1
	CMakeFiles/Makefile2:12824: recipe for target 'tools/clang/lib/Basic/CMakeFiles/clangBasic.dir/all' failed
	make[1]: *** [tools/clang/lib/Basic/CMakeFiles/clangBasic.dir/all] Error 2
	make[1]: *** 正在等待未完成的任务....
	[ 75%] Building CXX object tools/clang/lib/Rewrite/CMakeFiles/clangRewrite.dir/Rewr
											     Even thought i follow install instructions from llvm home-page, i get it simliar.What am i missing?
	kernel version:4.17.0-rc7+
	cmake -version cmake version 3.7.2
	gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1)
	debian os

	Thank you in advance.

	Please cc me i am not subscribe the lists, thx!