title: pip install py-find-1st fails on ubuntu20 & centos with python3.9
body: <p>This is my process.</p>
  <p>I start a new aws t2.micro ec2 on ubuntu20 and run this script</p>
  <pre><code>sudo apt-get update
  sudo apt-get install gcc
  sudo apt-get install python3.9
  sudo apt-get install python3.9-venv
  curl --silent --show-error --retry 5 https://bootstrap.pypa.io/get-pip.py &gt; get-pip.py
  python3.9 get-pip.py
  sudo apt-get install python-dev
  sudo apt-get install python3-dev
  python3.9 -m pip install --upgrade pip
  python3.9 -m pip install --upgrade pip setuptools
  python3.9 -m pip install --upgrade wheel
  python3.9 -m pip install testresources
  sudo apt-get install build-essential
  sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev wget liblzma-dev lzma
  sudo apt-get install python3-devel
  python3.9 -m pip install p5py
  python3.9 -m pip install PEP517
  python3.9 -m pip install py-find-1st
  </code></pre>
  <p>The last line is the problem</p>
  <p>I get this output (error is at the bottom, I included more output incase it's helpful, had to trim output a little bit)</p>
  <p><div class="snippet" data-lang="js" data-hide="true" data-console="false" data-babel="false">
  <div class="snippet-code snippet-currently-hidden">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>Preparing to unpack .../python3.9-venv_3.9.5-3~20.04.1_amd64.deb ...
  Unpacking python3.9-venv (3.9.5-3~20.04.1) ...
  Setting up python-pip-whl (20.0.2-5ubuntu1.5) ...
  Setting up python3.9-venv (3.9.5-3~20.04.1) ...
  Defaulting to user installation because normal site-packages is not writeable
  Collecting pip
    Downloading pip-21.1.3-py3-none-any.whl (1.5 MB)
       |████████████████████████████████| 1.5 MB 5.0 MB/s 
  Collecting wheel
    Downloading wheel-0.36.2-py2.py3-none-any.whl (35 kB)
  Installing collected packages: wheel, pip
    WARNING: The script wheel is installed in '/home/ubuntu/.local/bin' which is not on PATH.
    Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
    WARNING: The scripts pip, pip3 and pip3.9 are installed in '/home/ubuntu/.local/bin' which is not on PATH.
    Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  Successfully installed pip-21.1.3 wheel-0.36.2
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Note, selecting 'python-dev-is-python2' instead of 'python-dev'
  The following additional packages will be installed:
    libexpat1-dev libpython2-dev libpython2-stdlib libpython2.7 libpython2.7-dev libpython2.7-minimal
    libpython2.7-stdlib python-is-python2 python2 python2-dev python2-minimal python2.7 python2.7-dev
    python2.7-minimal
  Suggested packages:
    python2-doc python-tk python2.7-doc binfmt-support
  The following NEW packages will be installed:
    libexpat1-dev libpython2-dev libpython2-stdlib libpython2.7 libpython2.7-dev libpython2.7-minimal
    libpython2.7-stdlib python-dev-is-python2 python-is-python2 python2 python2-dev python2-minimal python2.7
    python2.7-dev python2.7-minimal
  0 upgraded, 15 newly installed, 0 to remove and 78 not upgraded.
  Need to get 7744 kB of archives.
  After this operation, 35.1 MB of additional disk space will be used.
  Do you want to continue? [Y/n] Y
  Get:1 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 libpython2.7-minimal amd64 2.7.18-1~20.04.1 [335 kB]
  Get:2 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 python2.7-minimal amd64 2.7.18-1~20.04.1 [1285 kB]
  Get:3 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/universe amd64 python2-minimal amd64 2.7.17-2ubuntu4 [27.5 kB]
  Get:4 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 libpython2.7-stdlib amd64 2.7.18-1~20.04.1 [1887 kB]
  Get:5 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 python2.7 amd64 2.7.18-1~20.04.1 [248 kB]
  Get:6 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/universe amd64 libpython2-stdlib amd64 2.7.17-2ubuntu4 [7072 B]
  Get:7 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/universe amd64 python2 amd64 2.7.17-2ubuntu4 [26.5 kB]
  Get:8 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 libexpat1-dev amd64 2.2.9-1build1 [116 kB]
  Get:9 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 libpython2.7 amd64 2.7.18-1~20.04.1 [1038 kB]
  Get:10 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 libpython2.7-dev amd64 2.7.18-1~20.04.1 [2475 kB]
  Get:11 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/universe amd64 libpython2-dev amd64 2.7.17-2ubuntu4 [7140 B]
  Get:12 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/universe amd64 python-is-python2 all 2.7.17-4 [2496 B]
  Get:13 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 python2.7-dev amd64 2.7.18-1~20.04.1 [287 kB]
  Get:14 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/universe amd64 python2-dev amd64 2.7.17-2ubuntu4 [1268 B]
  Get:15 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/universe amd64 python-dev-is-python2 all 2.7.17-4 [1396 B]
  Fetched 7744 kB in 0s (46.3 MB/s)           
  Selecting previously unselected package libpython2.7-minimal:amd64.
  (Reading database ... 65082 files and directories currently installed.)
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  Setting up libpython2.7-minimal:amd64 (2.7.18-1~20.04.1) ...
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  Unpacking libpython2.7:amd64 (2.7.18-1~20.04.1) ...
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  Setting up libpython2.7-stdlib:amd64 (2.7.18-1~20.04.1) ...
  Setting up libexpat1-dev:amd64 (2.2.9-1build1) ...
  Setting up libpython2.7:amd64 (2.7.18-1~20.04.1) ...
  Setting up libpython2.7-dev:amd64 (2.7.18-1~20.04.1) ...
  Setting up python2.7 (2.7.18-1~20.04.1) ...
  Setting up libpython2-stdlib:amd64 (2.7.17-2ubuntu4) ...
  Setting up python2 (2.7.17-2ubuntu4) ...
  Setting up libpython2-dev:amd64 (2.7.17-2ubuntu4) ...
  Setting up python-is-python2 (2.7.17-4) ...
  Setting up python2.7-dev (2.7.18-1~20.04.1) ...
  Setting up python2-dev (2.7.17-2ubuntu4) ...
  Setting up python-dev-is-python2 (2.7.17-4) ...
  Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
  Processing triggers for man-db (2.9.1-1) ...
  Processing triggers for mime-support (3.64ubuntu1) ...
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  The following additional packages will be installed:
    libpython3-dev libpython3.8 libpython3.8-dev libpython3.8-minimal libpython3.8-stdlib python3.8 python3.8-dev
    python3.8-minimal zlib1g-dev
  Suggested packages:
    python3.8-venv python3.8-doc binfmt-support
  The following NEW packages will be installed:
    libpython3-dev libpython3.8-dev python3-dev python3.8-dev zlib1g-dev
  The following packages will be upgraded:
    libpython3.8 libpython3.8-minimal libpython3.8-stdlib python3.8 python3.8-minimal
  5 upgraded, 5 newly installed, 0 to remove and 73 not upgraded.
  Need to get 10.9 MB of archives.
  After this operation, 21.2 MB of additional disk space will be used.
  Do you want to continue? [Y/n] Y
  Get:1 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/main amd64 python3.8 amd64 3.8.10-0ubuntu1~20.04 [387 kB]
  Get:2 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/main amd64 libpython3.8 amd64 3.8.10-0ubuntu1~20.04 [1625 kB]
  Get:3 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/main amd64 libpython3.8-stdlib amd64 3.8.10-0ubuntu1~20.04 [1675 kB]
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  Get:5 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/main amd64 libpython3.8-minimal amd64 3.8.10-0ubuntu1~20.04 [717 kB]
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  Get:9 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/main amd64 python3.8-dev amd64 3.8.10-0ubuntu1~20.04 [510 kB]
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  Fetched 10.9 MB in 0s (42.5 MB/s) 
  (Reading database ... 66030 files and directories currently installed.)
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  Unpacking python3.8 (3.8.10-0ubuntu1~20.04) over (3.8.5-1~20.04.2) ...
  Preparing to unpack .../1-libpython3.8_3.8.10-0ubuntu1~20.04_amd64.deb ...
  Unpacking libpython3.8:amd64 (3.8.10-0ubuntu1~20.04) over (3.8.5-1~20.04.2) ...
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  Unpacking libpython3.8-stdlib:amd64 (3.8.10-0ubuntu1~20.04) over (3.8.5-1~20.04.2) ...
  Preparing to unpack .../3-python3.8-minimal_3.8.10-0ubuntu1~20.04_amd64.deb ...
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  Selecting previously unselected package libpython3-dev:amd64.
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  Unpacking libpython3-dev:amd64 (3.8.2-0ubuntu2) ...
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  Setting up python3.8-minimal (3.8.10-0ubuntu1~20.04) ...
  Setting up libpython3.8-stdlib:amd64 (3.8.10-0ubuntu1~20.04) ...
  Setting up python3.8 (3.8.10-0ubuntu1~20.04) ...
  Setting up libpython3.8:amd64 (3.8.10-0ubuntu1~20.04) ...
  Setting up libpython3.8-dev:amd64 (3.8.10-0ubuntu1~20.04) ...
  Setting up python3.8-dev (3.8.10-0ubuntu1~20.04) ...
  Setting up libpython3-dev:amd64 (3.8.2-0ubuntu2) ...
  Setting up python3-dev (3.8.2-0ubuntu2) ...
  Processing triggers for libc-bin (2.31-0ubuntu9.2) ...
  Processing triggers for man-db (2.9.1-1) ...
  Processing triggers for mime-support (3.64ubuntu1) ...
  Defaulting to user installation because normal site-packages is not writeable
  Requirement already satisfied: pip in ./.local/lib/python3.9/site-packages (21.1.3)
  Defaulting to user installation because normal site-packages is not writeable
  Requirement already satisfied: pip in ./.local/lib/python3.9/site-packages (21.1.3)
  Requirement already satisfied: setuptools in /usr/lib/python3/dist-packages (45.2.0)
  Collecting setuptools
    Downloading setuptools-57.4.0-py3-none-any.whl (819 kB)
       |████████████████████████████████| 819 kB 5.0 MB/s 
  Installing collected packages: setuptools
  ERROR: pip's dependency resolver does not currently take into account all the packages that are installed. This behaviour is the source of the following dependency conflicts.
  launchpadlib 1.10.13 requires testresources, which is not installed.
  Successfully installed setuptools-57.4.0
  Defaulting to user installation because normal site-packages is not writeable
  Requirement already satisfied: wheel in ./.local/lib/python3.9/site-packages (0.36.2)
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  The following additional packages will be installed:
    dpkg-dev fakeroot g++ g++-9 libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libdpkg-perl
    libfakeroot libfile-fcntllock-perl libstdc++-9-dev make
  Suggested packages:
    debian-keyring g++-multilib g++-9-multilib gcc-9-doc bzr libstdc++-9-doc make-doc
  The following NEW packages will be installed:
    build-essential dpkg-dev fakeroot g++ g++-9 libalgorithm-diff-perl libalgorithm-diff-xs-perl
    libalgorithm-merge-perl libdpkg-perl libfakeroot libfile-fcntllock-perl libstdc++-9-dev make
  0 upgraded, 13 newly installed, 0 to remove and 73 not upgraded.
  Need to get 11.4 MB of archives.
  After this operation, 52.2 MB of additional disk space will be used.
  Do you want to continue? [Y/n] Y
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  Get:5 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 libdpkg-perl all 1.19.7ubuntu3 [230 kB]
  Get:6 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 dpkg-dev all 1.19.7ubuntu3 [679 kB]
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  Get:10 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 libalgorithm-diff-perl all 1.19.03-2 [46.6 kB]
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  Get:13 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 libfile-fcntllock-perl amd64 0.22-3build4 [33.1 kB]
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  Get:98 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 x11-utils amd64 7.7+5 [199 kB]
  Get:99 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 xbitmaps all 1.1.1-2 [28.1 kB]
  Get:100 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/universe amd64 xterm amd64 353-1ubuntu1.20.04.2 [765 kB]
  Get:101 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 libffi-dev amd64 3.3-4 [57.0 kB]
  Get:102 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal-updates/main amd64 liblzma-dev amd64 5.2.4-1ubuntu1 [147 kB]
  Get:103 http://us-east-2.ec2.archive.ubuntu.com/ubuntu focal/main amd64 libreadline-gplv2-dev amd64 5.2+dfsg-3build3 [125 kB]
  Fetched 47.5 MB in 1s (53.2 MB/s)             
  Extracting templates from packages: 100%
  Preconfiguring packages ...
  
    Created wheel for p5py: filename=p5py-1.0.0-py2.py3-none-any.whl size=2333 sha256=e7417e00f0c9701b6889208ba42a352140b10d38748267029e0b3f5adb557857
    Stored in directory: /home/ubuntu/.cache/pip/wheels/72/c3/3e/d2e21f7f687d90134f4774eee0b36f1b3303ef35d4ebf832c7
  Successfully built p5py
  Installing collected packages: p5py
  Successfully installed p5py-1.0.0
  Defaulting to user installation because normal site-packages is not writeable
  Collecting PEP517
    Downloading pep517-0.11.0-py2.py3-none-any.whl (19 kB)
  Collecting tomli
    Downloading tomli-1.0.4-py3-none-any.whl (11 kB)
  Installing collected packages: tomli, PEP517
  Successfully installed PEP517-0.11.0 tomli-1.0.4
  Defaulting to user installation because normal site-packages is not writeable
  Collecting py-find-1st
    Downloading py_find_1st-1.1.5.tar.gz (8.8 kB)
    Installing build dependencies ... done
    Getting requirements to build wheel ... done
      Preparing wheel metadata ... done
  Collecting numpy&gt;=1.13.0
    Downloading numpy-1.21.1-cp39-cp39-manylinux_2_12_x86_64.manylinux2010_x86_64.whl (15.8 MB)
       |████████████████████████████████| 15.8 MB 6.0 MB/s 
  Building wheels for collected packages: py-find-1st
    Building wheel for py-find-1st (PEP 517) ... error
    ERROR: Command errored out with exit status 1:
     command: /usr/bin/python3.9 /home/ubuntu/.local/lib/python3.9/site-packages/pip/_vendor/pep517/in_process/_in_process.py build_wheel /tmp/tmp47_3kk6k
         cwd: /tmp/pip-install-pvu0gblm/py-find-1st_36eb63373254485b8448e2b46d13c71f
    Complete output (20 lines):
    /tmp/pip-build-env-qm53q7xb/overlay/lib/python3.9/site-packages/setuptools/dist.py:697: UserWarning: Usage of dash-separated 'description-file' will not be supported in future versions. Please use the underscore name 'description_file' instead
      warnings.warn(
    running bdist_wheel
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-3.9
    creating build/lib.linux-x86_64-3.9/utils_find_1st
    copying utils_find_1st/__init__.py -&gt; build/lib.linux-x86_64-3.9/utils_find_1st
    running build_ext
    check for clang compiler ... no
    building 'find_1st' extension
    creating build/temp.linux-x86_64-3.9
    creating build/temp.linux-x86_64-3.9/utils_find_1st
    x86_64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -DNPY_NO_DEPRECATED_API=NPY_1_13_API_VERSION -I/tmp/pip-build-env-qm53q7xb/overlay/lib/python3.9/site-packages/numpy/core/include -I/usr/include/python3.9 -c utils_find_1st/find_1st.cpp -o build/temp.linux-x86_64-3.9/utils_find_1st/find_1st.o
    utils_find_1st/find_1st.cpp:3:10: fatal error: Python.h: No such file or directory
        3 | #include "Python.h"
          |          ^~~~~~~~~~
    compilation terminated.
    error: command '/usr/bin/x86_64-linux-gnu-gcc' failed with exit code 1
    ----------------------------------------
    ERROR: Failed building wheel for py-find-1st
  Failed to build py-find-1st
  ERROR: Could not build wheels for py-find-1st which use PEP 517 and cannot be installed directly</code></pre>
  </div>
  </div>
  </p>
  <hr />
  <p>If you would like to reproduce the error, you can start a t2.micro ec2 running ubuntu20 and run the script listed above</p>