Unable to build SEH

[Like Ma]

I have built wclang on Ubuntu 16.04 with LLVM 11, which is from http://apt.llvm.org

But it can't build SEH sample by:

i686-w64-mingw32-clang -g -o seh.exe seh.c

seh.c:29:5: error: use of undeclared identifier '__try'
    __try
    ^
1 error generated.

How to solve it?