bcrypt can't be installed #8

I can't install bcrypt (and any other libraries, that used cffi in compile time).
Requirement already satisfied: cffi>=1.1 in ./venv/cross/lib/python3.6/site-packages (from bcrypt) Requirement already satisfied: six>=1.4.1 in ./venv/cross/lib/python3.6/site-packages (from bcrypt) Requirement already satisfied: pycparser in ./venv/cross/lib/python3.6/site-packages (from cffi>=1.1->bcrypt) Installing collected packages: bcrypt Running setup.py install for bcrypt ... error Complete output from command /root/source/venv/cross/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-y3sc7gpk/bcrypt/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-pw2_2nbg-record/install-record.txt --single-version-externally-managed --compile --install-headers /root/source/venv/cross/include/site/python3.6/bcrypt: ******************************************************* * Crossenv has leaked into another Python interpreter! * You should probably file a bug report. * Version 3.6.0 (default, Nov 7 2018, 18:40:18) [GCC 5.4.0 20160609] * Executable /root/source/venv/cross/bin/python3 ******************************************************* Traceback (most recent call last): File "<string>", line 1, in <module> File "/tmp/pip-build-y3sc7gpk/bcrypt/setup.py", line 238, in <module> **keywords_with_side_effects(sys.argv) File "/root/source/staging_dir/target-mipsel_24kc_musl-1.1.16/host/lib/python3.6/distutils/core.py", line 108, in setup _setup_distribution = dist = klass(attrs) File "/root/source/venv/build/lib/python3.6/site-packages/setuptools/dist.py", line 318, in __init__ _Distribution.__init__(self, attrs) File "/root/source/staging_dir/target-mipsel_24kc_musl-1.1.16/host/lib/python3.6/distutils/dist.py", line 281, in __init__ self.finalize_options() File "/root/source/venv/build/lib/python3.6/site-packages/setuptools/dist.py", line 376, in finalize_options ep.load()(self, ep.name, value) File "/root/source/venv/cross/lib/python3.6/site-packages/cffi/setuptools_ext.py", line 204, in cffi_modules add_cffi_module(dist, cffi_module) File "/root/source/venv/cross/lib/python3.6/site-packages/cffi/setuptools_ext.py", line 49, in add_cffi_module execfile(build_file_name, mod_vars) File "/root/source/venv/cross/lib/python3.6/site-packages/cffi/setuptools_ext.py", line 25, in execfile exec(code, glob, glob) File "src/build_bcrypt.py", line 21, in <module> ffi = FFI() File "/root/source/venv/cross/lib/python3.6/site-packages/cffi/api.py", line 46, in __init__ import _cffi_backend as backend ImportError: /root/source/venv/cross/lib/python3.6/site-packages/_cffi_backend.cpython-36.so: wrong ELF class: ELFCLASS32

As you can see, installing via pip completes for cffi, and then fails for bcrypt because _cffi_backend.cpython-36.so compiled for HOST platform, but used in compile time on the BUILD machine.