/usr/bin/x86_64-w64-mingw32-ocamlc
/usr/bin/x86_64-w64-mingw32-ocamlcp
/usr/bin/x86_64-w64-mingw32-ocamldep
/usr/bin/x86_64-w64-mingw32-ocamlmklib
/usr/bin/x86_64-w64-mingw32-ocamlmktop
/usr/bin/x86_64-w64-mingw32-ocamlopt
/usr/bin/x86_64-w64-mingw32-ocamlprof
/usr/bin/x86_64-w64-mingw32-ocamlrun
You may install this package on Debian with
apt-get
install ocaml-mingw-w64-x86-64