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I cant install requirements.txt

getting this error

ERROR: Command errored out with exit status 1: command: /usr/bin/python3 /home/osmc/.local/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-8tvxl934/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.6.0' wheel 'cffi>=1.8,!=1.11.3; platform_python_implementation != '"'"'PyPy'"'"'' cwd: None Complete output (74 lines): Collecting setuptools>=40.6.0 Using cached setuptools-53.0.0-py3-none-any.whl (784 kB) Collecting wheel Using cached wheel-0.36.2-py2.py3-none-any.whl (35 kB) Collecting cffi!=1.11.3,>=1.8 Using cached cffi-1.14.5.tar.gz (475 kB) Collecting pycparser Using cached pycparser-2.20-py2.py3-none-any.whl (112 kB) Using legacy 'setup.py install' for cffi, since package 'wheel' is not installed. Installing collected packages: pycparser, wheel, setuptools, cffi Running setup.py install for cffi: started Running setup.py install for cffi: finished with status 'error' ERROR: Command errored out with exit status 1: command: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-x8t77nyn/cffi_72e5641f5682469fa8dcfa34b0b1cbf8/setup.py'"'"'; file='"'"'/tmp/pip-install-x8t77nyn/cffi_72e5641f5682469fa8dcfa34b0b1cbf8/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-record-1b2k_euj/install-record.txt --single-version-externally-managed --prefix /tmp/pip-build-env-8tvxl934/overlay --compile --install-headers /tmp/pip-build-env-8tvxl934/overlay/include/python3.7m/cffi cwd: /tmp/pip-install-x8t77nyn/cffi_72e5641f5682469fa8dcfa34b0b1cbf8/ Complete output (56 lines): Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found Package libffi was not found in the pkg-config search path. Perhaps you should add the directory containing `libffi.pc' to the PKG_CONFIG_PATH environment variable No package 'libffi' found running install running build running build_py creating build creating build/lib.linux-armv7l-3.7 creating build/lib.linux-armv7l-3.7/cffi copying cffi/ffiplatform.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/backend_ctypes.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/cffi_opcode.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/cparser.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/verifier.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/error.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/lock.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/commontypes.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/init.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/vengine_cpy.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/model.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/recompiler.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/setuptools_ext.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/vengine_gen.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/api.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/pkgconfig.py -> build/lib.linux-armv7l-3.7/cffi copying cffi/_cffi_include.h -> build/lib.linux-armv7l-3.7/cffi copying cffi/parse_c_type.h -> build/lib.linux-armv7l-3.7/cffi copying cffi/_embedding.h -> build/lib.linux-armv7l-3.7/cffi copying cffi/_cffi_errors.h -> build/lib.linux-armv7l-3.7/cffi running build_ext building '_cffi_backend' extension creating build/temp.linux-armv7l-3.7 creating build/temp.linux-armv7l-3.7/c arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DUSE__THREAD -DHAVE_SYNC_SYNCHRONIZE -I/usr/include/ffi -I/usr/include/libffi -I/usr/include/python3.7m -c c/_cffi_backend.c -o build/temp.linux-armv7l-3.7/c/_cffi_backend.o c/_cffi_backend.c:2:10: fatal error: Python.h: No such file or directory #include <Python.h> ^~~~~~~~~~ compilation terminated. error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1 ---------------------------------------- ERROR: Command errored out with exit status 1: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-x8t77nyn/cffi_72e5641f5682469fa8dcfa34b0b1cbf8/setup.py'"'"'; file='"'"'/tmp/pip-install-x8t77nyn/cffi_72e5641f5682469fa8dcfa34b0b1cbf8/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-record-1b2k_euj/install-record.txt --single-version-externally-managed --prefix /tmp/pip-build-env-8tvxl934/overlay --compile --install-headers /tmp/pip-build-env-8tvxl934/overlay/include/python3.7m/cffi Check the logs for full command output.

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WARNING: Discarding https://files.pythonhosted.org/packages/94/5c/42de91c7fbdb817b2d9a4e64b067946eb38a4eb36c1a09c96c87a0f86a82/cryptography-3.2.1.tar.gz#sha256=d3d5e10be0cf2a12214ddee45c6bd203dab435e3d83b4560c03066eda600bfe3 (from https://pypi.org/simple/cryptography/) (requires-python:>=2.7,!=3.0.,!=3.1.,!=3.2.,!=3.3.,!=3.4.*). Command errored out with exit status 1: /usr/bin/python3 /home/osmc/.local/lib/python3.7/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-8tvxl934/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.6.0' wheel 'cffi>=1.8,!=1.11.3; platform_python_implementation != '"'"'PyPy'"'"'' Check the logs for full command output. ERROR: Could not find a version that satisfies the requirement cryptography==3.2.1 ERROR: No matching distribution found for cryptography==3.2.1