pip build fails on mac

[Zardinality]

While running pip install pqkmeans:

[ 28%] Building CXX object CMakeFiles/_pqkmeans.dir/src/clustering/bkmeans.cpp.o
    In file included from /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/src/_pqkmeans.cpp:3:
    In file included from /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/src/encoder/encoder_sample.h:6:
    In file included from /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/ext/pybind/include/pybind11/stl.h:34:
    /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/experimental/optional:18:3: warning: "<experimental/optional> has been removed. Use <optional> instead." [-W#warnings]
    # warning "<experimental/optional> has been removed. Use <optional> instead."
      ^
    In file included from /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/src/_pqkmeans.cpp:3:
    In file included from /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/src/encoder/encoder_sample.h:6:
    /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/ext/pybind/include/pybind11/stl.h:283:46: error: no member named 'experimental' in namespace 'std'
    template<typename T> struct type_caster<std::experimental::optional<T>>
                                            ~~~~~^
    /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/ext/pybind/include/pybind11/stl.h:283:69: error: 'T' does not refer to a value
    template<typename T> struct type_caster<std::experimental::optional<T>>
                                                                        ^
    /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/ext/pybind/include/pybind11/stl.h:283:19: note: declared here
    template<typename T> struct type_caster<std::experimental::optional<T>>
                      ^
    /private/var/folders/pz/ckv4fct52c7_826fg4x48vgm0000gn/T/pip-install-khtx799x/pqkmeans/ext/pybind/include/pybind11/stl.h:286:36: error: no member named 'experimental' in namespace 'std'
    template<> struct type_caster<std::experimental::nullopt_t>
                                  ~~~~~^
    1 warning and 3 errors generated.
    make[2]: *** [CMakeFiles/_pqkmeans.dir/src/_pqkmeans.cpp.o] Error 1
    make[2]: *** Waiting for unfinished jobs....
    make[1]: *** [CMakeFiles/_pqkmeans.dir/all] Error 2
    make: *** [all] Error 2

My enviroment details is:

ProductName:	Mac OS X
ProductVersion:	10.15
BuildVersion:	19A583

Darwin MacBook-Pro.local 19.0.0 Darwin Kernel Version 19.0.0: Wed Sep 25 20:18:50 PDT 2019; root:xnu-6153.11.26~2/RELEASE_X86_64 x86_64

[Hi-king]

@Zardinality We have updated this library to be available on latest Mac OS (see #33 for more details).
Could you try pip install pqkmeans again?

[Zardinality]

@Hi-king Thanks for the update. I can report now with pip install pqkmeans==1.04 works for me. A side note is when I use pip install pqkmeans directly it fails to locate the correct version.
Since the problem is solved now I hereby close this issue.