title: Can't install Pip package on Raspberry PI 4 (adafruit_circuitpython_neopixel)
body: <p>I'm trying to install the library above on a Raspberry Pi 4 running Raspbian Buster / RetroPi .</p>
  <p>Setup collects packages, and then fails on <code>setup.py</code> stating:</p>
  <pre><code>* Setup can't determine the value of PAGE_SIZE on your system, so it will
      * default to 4096 which may not be correct.
  </code></pre>
  <p>More diagnostics/troubleshooting tried:</p>
  <ul>
  <li>I've installed the same package previously on a Raspberry Pi 3 without issue (Which I think was also running Buster)</li>
  <li>I've managed to install other python packages on the Pi 4 using <code>pip3 install</code> i.e. <code>tornado</code>, <code>colorzero</code> etc.</li>
  <li>I've run <code>sudo apt update &amp;&amp; sudo apt upgrade</code> + rebooting- didn't help</li>
  <li>I've tried python 2 (<code>pip install pip install adafruit-circuitpython-neopixel</code>) - same error</li>
  </ul>
  <p>Any help would be appreciated - thanks!</p>
  <p>Full Error:</p>
  <pre><code>pip3 install adafruit-circuitpython-neopixel
  Defaulting to user installation because normal site-packages is not writeable
  Collecting adafruit-circuitpython-neopixel
    Using cached adafruit-circuitpython-neopixel-6.0.3.tar.gz (28 kB)
  Collecting Adafruit-Blinka
    Using cached Adafruit-Blinka-6.4.2.tar.gz (122 kB)
  Collecting adafruit-circuitpython-pypixelbuf&gt;=2.0.0
    Using cached adafruit-circuitpython-pypixelbuf-2.2.4.tar.gz (28 kB)
  Collecting Adafruit-PlatformDetect&gt;=3.1.0
    Using cached Adafruit-PlatformDetect-3.5.0.tar.gz (29 kB)
  Collecting Adafruit-PureIO&gt;=1.1.7
    Using cached Adafruit_PureIO-1.1.8.tar.gz (26 kB)
  Collecting pyftdi&gt;=0.40.0
    Using cached pyftdi-0.52.9-py3-none-any.whl (139 kB)
  Requirement already satisfied: RPi.GPIO in /usr/lib/python3/dist-packages (from Adafruit-Blinka-&gt;adafruit-circuitpython-neopixel) (0.7.0)
  Collecting rpi_ws281x&gt;=4.0.0
    Using cached rpi_ws281x-4.2.6.tar.gz (63 kB)
  Collecting sysv_ipc&gt;=1.1.0
    Using cached sysv_ipc-1.1.0.tar.gz (99 kB)
  Requirement already satisfied: pyusb&gt;=1.0.0 in /usr/local/lib/python3.7/dist-packages (from pyftdi&gt;=0.40.0-&gt;Adafruit-Blinka-&gt;adafruit-circuitpython-neopixel) (1.1.1)
  Requirement already satisfied: pyserial&gt;=3.0 in /usr/local/lib/python3.7/dist-packages (from pyftdi&gt;=0.40.0-&gt;Adafruit-Blinka-&gt;adafruit-circuitpython-neopixel) (3.5)
  Using legacy 'setup.py install' for adafruit-circuitpython-neopixel, since package 'wheel' is not installed.
  Using legacy 'setup.py install' for adafruit-circuitpython-pypixelbuf, since package 'wheel' is not installed.
  Using legacy 'setup.py install' for Adafruit-Blinka, since package 'wheel' is not installed.
  Using legacy 'setup.py install' for Adafruit-PlatformDetect, since package 'wheel' is not installed.
  Using legacy 'setup.py install' for Adafruit-PureIO, since package 'wheel' is not installed.
  Using legacy 'setup.py install' for rpi-ws281x, since package 'wheel' is not installed.
  Using legacy 'setup.py install' for sysv-ipc, since package 'wheel' is not installed.
  Installing collected packages: sysv-ipc, rpi-ws281x, pyftdi, Adafruit-PureIO, Adafruit-PlatformDetect, Adafruit-Blinka, adafruit-circuitpython-pypixelbuf, adafruit-circuitpython-neopixel
      Running setup.py install for sysv-ipc ... error
      ERROR: Command errored out with exit status 1:
       command: /usr/bin/python3 -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '&quot;'&quot;'/tmp/pip-install-9qk3bog7/sysv-ipc_2c9b66fe81a04f5c99cf319aff553101/setup.py'&quot;'&quot;'; __file__='&quot;'&quot;'/tmp/pip-install-9qk3bog7/sysv-ipc_2c9b66fe81a04f5c99cf319aff553101/setup.py'&quot;'&quot;';f=getattr(tokenize, '&quot;'&quot;'open'&quot;'&quot;', open)(__file__);code=f.read().replace('&quot;'&quot;'\r\n'&quot;'&quot;', '&quot;'&quot;'\n'&quot;'&quot;');f.close();exec(compile(code, __file__, '&quot;'&quot;'exec'&quot;'&quot;'))' install --record /tmp/pip-record-d842td8m/install-record.txt --single-version-externally-managed --user --prefix= --compile --install-headers /home/pi/.local/include/python3.7m/sysv-ipc
           cwd: /tmp/pip-install-9qk3bog7/sysv-ipc_2c9b66fe81a04f5c99cf319aff553101/
      Complete output (19 lines):
      ******************************************************************************
      * Setup can't determine the value of PAGE_SIZE on your system, so it will
      * default to 4096 which may not be correct.
      *
      * Please report this message and your operating system info to the package
      * maintainer listed in the README file.
      ******************************************************************************
      running install
      running build
      running build_ext
      building 'sysv_ipc' extension
      creating build
      creating build/temp.linux-armv7l-3.7
      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 -I/usr/include/python3.7m -c sysv_ipc_module.c -o build/temp.linux-armv7l-3.7/sysv_ipc_module.o
      sysv_ipc_module.c:32:10: fatal error: Python.h: No such file or directory
       #include &quot;Python.h&quot;
                ^~~~~~~~~~
      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] = '&quot;'&quot;'/tmp/pip-install-9qk3bog7/sysv-ipc_2c9b66fe81a04f5c99cf319aff553101/setup.py'&quot;'&quot;'; __file__='&quot;'&quot;'/tmp/pip-install-9qk3bog7/sysv-ipc_2c9b66fe81a04f5c99cf319aff553101/setup.py'&quot;'&quot;';f=getattr(tokenize, '&quot;'&quot;'open'&quot;'&quot;', open)(__file__);code=f.read().replace('&quot;'&quot;'\r\n'&quot;'&quot;', '&quot;'&quot;'\n'&quot;'&quot;');f.close();exec(compile(code, __file__, '&quot;'&quot;'exec'&quot;'&quot;'))' install --record /tmp/pip-record-d842td8m/install-record.txt --single-version-externally-managed --user --prefix= --compile --install-headers /home/pi/.local/include/python3.7m/sysv-ipc Check the logs for full command output.
  </code></pre>