Are you explicitly building from source (e.g. with a --no-binary flag)? Or are you just executing the regular pip install and the windows wheels are not picked up? I'm currently investigating into doing a "proper" static build on windows, including the dependent libs; meanwhile, the prebuilt wheels should help resolve the windows installation issues.

@hoefling It fails for me this way when I do pip install . from a fresh checkout.
On the other hand just doing pip install xmlsec leads to errors of missing xmlsec.exe or xmlsec1.exe

@Neurochrom can you add the full log of pip install xmlsec --no-cache-dir -vvv? That's a weird error with missing exe files.

`
$ pip install xmlsec --no-cache-dir -vvv
Non-user install because site-packages writeable
Created temporary directory: C:\Users\raficki\AppData\Local\Temp\pip-ephem-wheel-cache-obawy2tw
Created temporary directory: C:\Users\raficki\AppData\Local\Temp\pip-req-tracker-rd7t0j30
Initialized build tracking at C:\Users\raficki\AppData\Local\Temp\pip-req-tracker-rd7t0j30
Created build tracker: C:\Users\raficki\AppData\Local\Temp\pip-req-tracker-rd7t0j30
Entered build tracker: C:\Users\raficki\AppData\Local\Temp\pip-req-tracker-rd7t0j30
Created temporary directory: C:\Users\raficki\AppData\Local\Temp\pip-install-0mg6i3pq
1 location(s) to search for versions of xmlsec:

• https://pypi.org/simple/xmlsec/
  Fetching project page and analyzing links: https://pypi.org/simple/xmlsec/
  Getting page https://pypi.org/simple/xmlsec/
  Found index url https://pypi.org/simple
  Starting new HTTPS connection (1): pypi.org:443
  https://pypi.org:443 "GET /simple/xmlsec/ HTTP/1.1" 200 4618
  Found link https://files.pythonhosted.org/packages/33/56/50fca01ea43aaecc2713ca2c7c160456a51b3bad55c77f3427bc9a060283/xmlsec-0.1.0.tar.gz#sha256=d166a70d4ac74a1aa0e7336af431ccee7cc0f3ed63203ff506e0a1440948ce88 (from https://pypi.org/simple/xmlsec/), version: 0.1.0
  Found link https://files.pythonhosted.org/packages/02/51/1d5a86001b638f280870018e7e7544a632c1432d569fd6a5f1ec7fcd08c1/xmlsec-0.1.1.tar.gz#sha256=83e83b97d53d78c94de2c462f8801744d6e0b7f8fc740b469fdf10b2aef8af65 (from https://pypi.org/simple/xmlsec/), version: 0.1.1
  Found link https://files.pythonhosted.org/packages/f1/52/8a1a175b70aa0e73654d3fcf07220a86a09a33eacf56394e1667e98f699b/xmlsec-0.1.2.tar.gz#sha256=233dabf1e1ff504dcdbf91d06025a0711ed8de5fff312d64bc704f7368f3a51b (from https://pypi.org/simple/xmlsec/), version: 0.1.2
  Found link https://files.pythonhosted.org/packages/f6/d2/ccaaf2b1949e18cbebca1db9603ffda97c0fe3c43db236f89abf372f0433/xmlsec-0.2.0.tar.gz#sha256=c5c8531039646045ffe5442b74db028bcd5c9b4249511b0cc1b7eee45c0e1139 (from https://pypi.org/simple/xmlsec/), version: 0.2.0
  Found link https://files.pythonhosted.org/packages/7c/94/a3fedbd0fa66efb6dca82081a02563c12299966b1918295f338fe9a488dc/xmlsec-0.3.0.tar.gz#sha256=2717ef9a2836b6ce719d08b4d5841cedb89af9197238dea87c73c10a295f397c (from https://pypi.org/simple/xmlsec/), version: 0.3.0
  Found link https://files.pythonhosted.org/packages/10/5e/d0918b2de681c14c03d96be57399ab98d45b76a994c77844c67624de9f81/xmlsec-0.3.1.tar.gz#sha256=fd50f38e5c65b5cb70d5faa0b32bf05eb91ab90b77e1bf22926519c1289e4caa (from https://pypi.org/simple/xmlsec/), version: 0.3.1
  Found link https://files.pythonhosted.org/packages/f7/ba/33cc2de8191ccf4ef90fcf7dacf71d66ad70068bc2d2b85915c1062ef138/xmlsec-0.3.3.tar.gz#sha256=f5d86bbe2d55e7bf576bc3a1c2c33068bac0725f23e57650980d451637b2c762 (from https://pypi.org/simple/xmlsec/), version: 0.3.3
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  Found link https://files.pythonhosted.org/packages/aa/21/f322ca9ad60e1dcae0041568c2833220a5535e2163a49c5cae46ffdc0bdd/xmlsec-0.6.0.tar.gz#sha256=dc96bdf46c6eb916604c76a121a69beadb9e5729debcb460f097ac2de575f404 (from https://pypi.org/simple/xmlsec/), version: 0.6.0
  Found link https://files.pythonhosted.org/packages/e1/ec/0330f39bc5eb270b6b62a9dbb11194c6d4215b48ef8d04c78a30dc1d2d1d/xmlsec-0.6.1.tar.gz#sha256=1bdb36f0c8e3be0cb980d8eff5c3b1e70ef758b998d07dd8b6cbb8993524b208 (from https://pypi.org/simple/xmlsec/), version: 0.6.1
  Found link https://files.pythonhosted.org/packages/14/18/f1f3980677b6c32c1f0c8b38fbf996c83f7c322c9d04aa34bf91995804d6/xmlsec-1.0.1.tar.gz#sha256=8527975779c8ad1a6347a893b604d6ca7ced1553ece4ebcc9269f6ec8a3aec44 (from https://pypi.org/simple/xmlsec/), version: 1.0.1
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  Found link https://files.pythonhosted.org/packages/01/00/c3062ee92e7b1f7a819390a595e78e18d4b28a6381cb055b3fb7eab9e59e/xmlsec-1.0.3.dev0.tar.gz#sha256=9c3983ee1fc82268aec54f44f8125f5c601d88b554e696ae67096e9e0a681cf9 (from https://pypi.org/simple/xmlsec/), version: 1.0.3.dev0
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  Found link https://files.pythonhosted.org/packages/ab/b7/db19c5b3231078a5f25d4de346e167ac56e2de862e5fb8159e8969fc3971/xmlsec-1.0.9.tar.gz#sha256=307bb107c359278faa77bf408cff955419d0eb0bf08d11428a333f60d7f46552 (from https://pypi.org/simple/xmlsec/), version: 1.0.9
  Found link https://files.pythonhosted.org/packages/a4/7d/dadea9c3d0c1c8f1f3a0c427f205be29f808a6deda1257281c93ec0af129/xmlsec-1.1.0.tar.gz#sha256=63d1ff6df08d0665be54d4fef19c191d984011c2cb1a32526958684fec38fc9d (from https://pypi.org/simple/xmlsec/), version: 1.1.0
  Found link https://files.pythonhosted.org/packages/c5/12/4eabe5a05804e8883ea9584c546df7c8aab20ee96d50ea55d2a62720151f/xmlsec-1.2.0.tar.gz#sha256=584db09e8e95bd4393b1cd631012f58f66fa2efec5f59ac204019f028cfe2dc3 (from https://pypi.org/simple/xmlsec/), version: 1.2.0
  Found link https://files.pythonhosted.org/packages/b6/ca/d87559f16a4f79870bf006109fa95119e76410e087f32b0e77050ffa2b06/xmlsec-1.3.1.tar.gz#sha256=8fe3877194e1daca83500fa7478bc51e6eb2f93835e2760d2c3fe8aaa1134d84 (from https://pypi.org/simple/xmlsec/), version: 1.3.1
  Found link https://files.pythonhosted.org/packages/57/2e/fd42a79472c19b7c01ead43ab3c2120554234441848ac790f9839993443e/xmlsec-1.3.2.tar.gz#sha256=dd4366f22aa4d99d7a207b7900c82e1fa75f3f93a1562b623300c94dfc129253 (from https://pypi.org/simple/xmlsec/), version: 1.3.2
  Found link https://files.pythonhosted.org/packages/35/42/d7cd323c91d4706f3cc32ffe7d5f851ab8ef9898ccb350f6ba593dd8b89a/xmlsec-1.3.3.tar.gz#sha256=e573c0172174973223d874ffd158ecd4e0faa761015474385289a6468dd29ed6 (from https://pypi.org/simple/xmlsec/), version: 1.3.3
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  Found link https://files.pythonhosted.org/packages/c3/e5/3e3183715fb3f98bd1ad44a7cc4a278bfeb800b9e9c2d50fe15f8522e548/xmlsec-1.3.8.tar.gz#sha256=86943fe2b31cd3b584d23987f404e9309f5251019c15bb565b3a65a4799425ce (from https://pypi.org/simple/xmlsec/) (requires-python:>=2.7, !=3.0., !=3.1., !=3.2., !=3.3., !=3.4.), version: 1.3.8
  Given no hashes to check 28 links for project 'xmlsec': discarding no candidates
  Using version 1.3.8 (newest of versions: 0.1.0, 0.1.1, 0.1.2, 0.2.0, 0.3.0, 0.3.1, 0.3.3, 0.4.0, 0.5.0, 0.6.0, 0.6.1, 1.0.1, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.1.0, 1.2.0, 1.3.1, 1.3.2, 1.3.3, 1.3.7, 1.3.8)
  Collecting xmlsec
  Created temporary directory: C:\Users\raficki\AppData\Local\Temp\pip-unpack-gonuzjgb
  Starting new HTTPS connection (1): files.pythonhosted.org:443
  https://files.pythonhosted.org:443 "GET /packages/d1/d8/79a8428557d511351f9f398d7c135bcdecb5d05fac5f907f8119ef486f9a/xmlsec-1.3.8-cp38-cp38-win_amd64.whl HTTP/1.1" 200 1872377
  Downloading xmlsec-1.3.8-cp38-cp38-win_amd64.whl (1.9 MB)
  |████████████████████████████████| 1.9 MB 187 kB/s
  Added xmlsec from https://files.pythonhosted.org/packages/d1/d8/79a8428557d511351f9f398d7c135bcdecb5d05fac5f907f8119ef486f9a/xmlsec-1.3.8-cp38-cp38-win_amd64.whl#sha256=317d1a7d7e69233890dc3d107a1da78769dc9239e7dc37a11824cdfe437496ad to build tracker 'C:\Users\raficki\AppData\Local\Temp\pip-req-tracker-rd7t0j30'
  Removed xmlsec from https://files.pythonhosted.org/packages/d1/d8/79a8428557d511351f9f398d7c135bcdecb5d05fac5f907f8119ef486f9a/xmlsec-1.3.8-cp38-cp38-win_amd64.whl#sha256=317d1a7d7e69233890dc3d107a1da78769dc9239e7dc37a11824cdfe437496ad from build tracker 'C:\Users\raficki\AppData\Local\Temp\pip-req-tracker-rd7t0j30'
  Requirement already satisfied: lxml>=3.8 in c:\python38\lib\site-packages (from xmlsec) (4.5.1)
  Installing collected packages: xmlsec
  Created temporary directory: C:\Users\raficki\AppData\Local\Temp\pip-unpacked-wheel-uwdd2twr

Successfully installed xmlsec-1.3.8
1 location(s) to search for versions of pip:

• https://pypi.org/simple/pip/
  Fetching project page and analyzing links: https://pypi.org/simple/pip/
  Getting page https://pypi.org/simple/pip/
  Found index url https://pypi.org/simple
  Starting new HTTPS connection (1): pypi.org:443
  https://pypi.org:443 "GET /simple/pip/ HTTP/1.1" 200 13603
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  Given no hashes to check 139 links for project 'pip': discarding no candidates
  Removed build tracker: 'C:\Users\raficki\AppData\Local\Temp\pip-req-tracker-rd7t0j30'
  `

This may be unrelated however I'm running into a similar issue on MacOs.

@pcrum please add the log of pip install xmlsec command.

pip install xmlsec
Collecting xmlsec
  Using cached https://files.pythonhosted.org/packages/c3/e5/3e3183715fb3f98bd1ad44a7cc4a278bfeb800b9e9c2d50fe15f8522e548/xmlsec-1.3.8.tar.gz
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
  Installing backend dependencies ... done
    Preparing wheel metadata ... done
Collecting lxml>=3.8 (from xmlsec)
  Using cached https://files.pythonhosted.org/packages/b4/57/581dcb7263d2c30c297bb0111a65c5d3eb870208b25a053044dfb3733ffc/lxml-4.5.1-cp38-cp38-macosx_10_9_x86_64.whl
Building wheels for collected packages: xmlsec
  Building wheel for xmlsec (PEP 517) ... error
  ERROR: Command errored out with exit status 1:
   command: /Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/bin/python3 /Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/tmpny63mm2f
       cwd: /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec
  Complete output (84 lines):
  running bdist_wheel
  running build
  running build_py
  package init file 'src/xmlsec/__init__.py' not found (or not a regular file)
  creating build
  creating build/lib.macosx-10.14-x86_64-3.8
  creating build/lib.macosx-10.14-x86_64-3.8/xmlsec
  copying src/xmlsec/py.typed -> build/lib.macosx-10.14-x86_64-3.8/xmlsec
  copying src/xmlsec/tree.pyi -> build/lib.macosx-10.14-x86_64-3.8/xmlsec
  copying src/xmlsec/__init__.pyi -> build/lib.macosx-10.14-x86_64-3.8/xmlsec
  copying src/xmlsec/constants.pyi -> build/lib.macosx-10.14-x86_64-3.8/xmlsec
  copying src/xmlsec/template.pyi -> build/lib.macosx-10.14-x86_64-3.8/xmlsec
  running build_ext
  building 'xmlsec' extension
  creating build/temp.macosx-10.14-x86_64-3.8
  creating build/temp.macosx-10.14-x86_64-3.8/private
  creating build/temp.macosx-10.14-x86_64-3.8/private/var
  creating build/temp.macosx-10.14-x86_64-3.8/private/var/folders
  creating build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0
  creating build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh
  creating build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T
  creating build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen
  creating build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec
  creating build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/constants.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/constants.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/exception.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/exception.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/exception.c:81:32: warning: 'PyThread_get_key_value' is deprecated [-Wdeprecated-declarations]
      v = (PyXmlSec_ErrorHolder*)PyThread_get_key_value(PyXmlSec_LastErrorKey);
                                 ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pythread.h:104:1: note: 'PyThread_get_key_value' has been explicitly marked deprecated here
  Py_DEPRECATED(3.7) PyAPI_FUNC(void *) PyThread_get_key_value(int key);
  ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pyport.h:515:54: note: expanded from macro 'Py_DEPRECATED'
  #define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
                                                       ^
  /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/exception.c:82:5: warning: 'PyThread_delete_key_value' is deprecated [-Wdeprecated-declarations]
      PyThread_delete_key_value(PyXmlSec_LastErrorKey);
      ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pythread.h:105:1: note: 'PyThread_delete_key_value' has been explicitly marked deprecated here
  Py_DEPRECATED(3.7) PyAPI_FUNC(void) PyThread_delete_key_value(int key);
  ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pyport.h:515:54: note: expanded from macro 'Py_DEPRECATED'
  #define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
                                                       ^
  /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/exception.c:83:9: warning: 'PyThread_set_key_value' is deprecated [-Wdeprecated-declarations]
      r = PyThread_set_key_value(PyXmlSec_LastErrorKey, (void*)e);
          ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pythread.h:102:1: note: 'PyThread_set_key_value' has been explicitly marked deprecated here
  Py_DEPRECATED(3.7) PyAPI_FUNC(int) PyThread_set_key_value(int key,
  ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pyport.h:515:54: note: expanded from macro 'Py_DEPRECATED'
  #define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
                                                       ^
  /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/exception.c:187:29: warning: 'PyThread_create_key' is deprecated [-Wdeprecated-declarations]
      PyXmlSec_LastErrorKey = PyThread_create_key();
                              ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pythread.h:100:1: note: 'PyThread_create_key' has been explicitly marked deprecated here
  Py_DEPRECATED(3.7) PyAPI_FUNC(int) PyThread_create_key(void);
  ^
  /usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8/pyport.h:515:54: note: expanded from macro 'Py_DEPRECATED'
  #define Py_DEPRECATED(VERSION_UNUSED) __attribute__((__deprecated__))
                                                       ^
  4 warnings generated.
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/template.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/template.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/utils.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/utils.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/main.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/main.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/keys.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/keys.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/ds.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/ds.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/lxml.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/lxml.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  In file included from /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/lxml.c:13:
  /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/etree_defs.h:266:14: warning: unused function 'lxml_unpack_xmldoc_capsule' [-Wunused-function]
  static void* lxml_unpack_xmldoc_capsule(PyObject* capsule, int* is_owned) {
               ^
  1 warning generated.
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/enc.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/enc.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/enc.c:186:14: warning: incompatible pointer types assigning to 'PyXmlSec_LxmlElementPtr *' (aka 'struct LxmlElement **') from 'PyXmlSec_LxmlElementPtr' (aka 'struct LxmlElement *') [-Wincompatible-pointer-types]
          elem = PyXmlSec_elementFactory(doc, n);
               ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  1 warning generated.
  clang -Wno-unused-result -Wsign-compare -Wunreachable-code -fno-common -dynamic -DNDEBUG -g -fwrapv -O3 -Wall -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -D__XMLSEC_FUNCTION__=__func__ -DXMLSEC_NO_SIZE_T -DXMLSEC_NO_GOST=1 -DXMLSEC_NO_GOST2012=1 -DXMLSEC_NO_CRYPTO_DYNAMIC_LOADING=1 -DXMLSEC_CRYPTO_OPENSSL=1 -DMODULE_NAME=xmlsec -DMODULE_VERSION=1.3.8 -I/usr/local/Cellar/libxmlsec1/1.2.30/include/xmlsec1 -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/openssl@1.1/include/openssl -I/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxml -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libxslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/libexslt -I/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-build-env-as0sc5eo/normal/lib/python3.8/site-packages/lxml/includes/__pycache__ -I/usr/local/include -I/usr/local/opt/openssl@1.1/include -I/usr/local/opt/sqlite/include -I/Users/phc107/Projects/aws-customerengagements-solutionengagement-securecerts/venv/include -I/usr/local/Cellar/python@3.8/3.8.3/Frameworks/Python.framework/Versions/3.8/include/python3.8 -c /private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/tree.c -o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/tree.o -g -std=c99 -fPIC -fno-strict-aliasing -Wno-error=declaration-after-statement -Werror=implicit-function-declaration -Os
  clang -bundle -undefined dynamic_lookup -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/constants.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/exception.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/template.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/utils.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/main.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/keys.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/ds.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/lxml.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/enc.o build/temp.macosx-10.14-x86_64-3.8/private/var/folders/g0/j4744jrs6tgfmyzk3kmbnyqxw24hwh/T/pip-install-wehateen/xmlsec/src/tree.o -L/usr/local/Cellar/libxmlsec1/1.2.30/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/lib -L/usr/local/opt/openssl@1.1/lib -L/usr/local/opt/sqlite/lib -lxmlsec1-openssl -lxmlsec1 -lcrypto -lxslt -lxml2 -lz -lpthread -licucore -lm -lxml2 -o build/lib.macosx-10.14-x86_64-3.8/xmlsec.cpython-38-darwin.so
  ld: unknown option: -platform_version
  clang-10: error: linker command failed with exit code 1 (use -v to see invocation)
  error: command 'clang' failed with exit status 1
  ----------------------------------------
  ERROR: Failed building wheel for xmlsec
  Running setup.py clean for xmlsec
Failed to build xmlsec
ERROR: Could not build wheels for xmlsec which use PEP 517 and cannot be installed directly

@pcrum this isn't related to xmlsec, check out Homebrew/homebrew-core#52461

Looks like this error exists also in python 3.8.2/Ubuntu 20.04
Edit: No, my mistake. I installed pkg-config and got it working..

I have this same problem on Ubuntu 20 in a docker container, but it literally started today. Yesterday I built the Docker image, which contains pip install -r requirements.txt as part of the Dockerfile, and everything worked fine. Today, I get the dreaded ERROR: Could not build wheels for xmlsec which use PEP 517 and cannot be installed directly error. Did something change overnight? I thought I read warnings from Pypi that something was changing today, but I can't find those warnings now. What can I do to help track down what's going on? Thanks!

EDIT: Found the issue. Need to have the following dependencies installed on ubuntu for it to build:
libxml2-dev
libxmlsec1-dev
libxmlsec1-openssl
pkg-config