does not compile with ocaml.4.08.0 about deriving HOT 1 OPEN

Configuration:
ocamlfind: ........................................... /home/jan/.opam/4.08.0/bin/ocamlfind
ocamlc: .............................................. /home/jan/.opam/4.08.0/bin/ocamlc.opt
ocamlopt: ............................................ /home/jan/.opam/4.08.0/bin/ocamlopt.opt
ocamlbuild: .......................................... /home/jan/.opam/4.08.0/bin/ocamlbuild
Package name: ........................................ deriving
Package version: ..................................... 0.8.1
os_type: ............................................. Unix
system: .............................................. linux
architecture: ........................................ amd64
ccomp_type: .......................................... cc
ocaml_version: ....................................... 4.08.0
standard_library_default: ............................ /home/jan/.opam/4.08.0/lib/ocaml
standard_library: .................................... /home/jan/.opam/4.08.0/lib/ocaml
bytecomp_c_compiler: ................................. gcc -O2 -fno-strict-aliasing -fwrapv -fPIC -D_FILE_OFFSET_BITS=64 -D_REENTRANT
native_c_compiler: ................................... gcc -O2 -fno-strict-aliasing -fwrapv -D_FILE_OFFSET_BITS=64 -D_REENTRANT
model: ............................................... default
ext_obj: ............................................. .o
ext_asm: ............................................. .s
ext_lib: ............................................. .a
ext_dll: ............................................. .so
default_executable_name: ............................. a.out
systhread_supported: ................................. true
Install architecture-independent files dir: .......... /usr/local
Install architecture-dependent files in dir: ......... $prefix
User executables: .................................... $exec_prefix/bin
System admin executables: ............................ $exec_prefix/sbin
Program executables: ................................. $exec_prefix/libexec
Read-only single-machine data: ....................... $prefix/etc
Modifiable architecture-independent data: ............ $prefix/com
Modifiable single-machine data: ...................... $prefix/var
Object code libraries: ............................... $exec_prefix/lib
Read-only arch-independent data root: ................ $prefix/share
Read-only architecture-independent data: ............. $datarootdir
Info documentation: .................................. $datarootdir/info
Locale-dependent data: ............................... $datarootdir/locale
Man documentation: ................................... $datarootdir/man
Documentation root: .................................. $datarootdir/doc/$pkg_name
HTML documentation: .................................. $docdir
DVI documentation: ................................... $docdir
PDF documentation: ................................... $docdir
PS documentation: .................................... $docdir
findlib_version: ..................................... 1.8.1
is_native: ........................................... true
suffix_program: ......................................
Remove a file.: ...................................... rm -f
Remove a directory.: ................................. rm -rf
Turn ocaml debug flag on: ............................ true
Turn ocaml profile flag on: .......................... false
Compiler support generation of .cmxs.: ............... true
OCamlbuild additional flags: .........................
type-conv support: ................................... false
Create documentations: ............................... true
Compile tests executable and library and run them: ... false
pkg_camlp4: .......................................... /home/jan/.opam/4.08.0/lib/ocaml/camlp4
pkg_camlp4_extend: ................................... /home/jan/.opam/4.08.0/lib/ocaml/camlp4
pkg_camlp4_quotations_o: ............................. /home/jan/.opam/4.08.0/lib/ocaml/camlp4
pkg_bytes: ........................................... /home/jan/.opam/4.08.0/lib/bytes
pkg_num: ............................................. /home/jan/.opam/4.08.0/lib/num
ocamldoc: ............................................ /home/jan/.opam/4.08.0/bin/ocamldoc