Linux 
CIL is a front-end for the C programming language that facilitates program analysis and transformation. CIL will parse and typecheck a program, and compile it into a simplified subset of C.
CIL supports ANSI C as well as most of the extensions of the GNU C and Microsoft C compilers. A Perl script acts as a drop in replacement for either gcc or Microsoft's cl, and allows merging of the source files in your project. Other features include support for control-flow and points-to analyses.
We follow the way the same as Goblint-cil(version 2.0) to change CIL(version 1.7.3) to another version compiled with dune.
For how to build and install, just see Goblint-cil (https://github.com/goblint/cil)
First create a local opam switch and install all dependencies:
opam switch -y create . --deps-only ocaml-base-compiler.4.14.0 --locked
Then, you can use dune to build tianshu-cil. Run the following commands to build:
dune build
You can also install tianshu-cil into the opam switch:
dune build @install dune install
need to fix and improve