/usr/x86_64-w64-mingw32/lib/ocaml/camlheader is in ocaml-mingw-w64-x86-64 4.01.0~20140328-1build6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1
#!/usr/x86_64-w64-mingw32/bin/ocamlrun