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I am trying to install a number of python 3 modules (e.g. regex, cytoolsz, spacy) that require compilation, but they all fail with an error identical to the below (bottom). I have tried to check for the presence of "limits.h" using the the grep below. I have reinstalled gcc, g++ build-essentials, python3-dev etc, but to no avail.

Check:

dpkg -S limits.h | grep linux

linux-headers-4.18.0-15: /usr/src/linux-headers-4.18.0-15/include/linux/dynamic_queue_limits.h

linux-libc-dev:amd64: /usr/include/linux/limits.h

linux-headers-4.19.0-041900rc8: /usr/src/linux-headers-4.19.0-041900rc8/include/uapi/linux/limits.h

linux-headers-4.18.0-14: /usr/src/linux-headers-4.18.0-14/include/linux/drbd_limits.h

linux-headers-4.18.0-15: /usr/src/linux-headers-4.18.0-15/arch/arm/include/asm/limits.h

linux-headers-4.18.0-14: /usr/src/linux-headers-4.18.0-14/include/uapi/linux/limits.h

linux-headers-4.18.0-14: /usr/src/linux-headers-4.18.0-14/include/linux/dynamic_queue_limits.h

libgcc-8-dev:amd64: /usr/lib/gcc/x86_64-linux-gnu/8/include-fixed/limits.h

linux-headers-4.18.0-14: /usr/src/linux-headers-4.18.0-14/arch/arm/include/asm/limits.h

linux-headers-4.18.0-15: /usr/src/linux-headers-4.18.0-15/include/linux/drbd_limits.h

linux-headers-4.19.0-041900rc8: /usr/src/linux-headers-4.19.0-041900rc8/include/linux/drbd_limits.h

linux-headers-4.18.0-15: /usr/src/linux-headers-4.18.0-15/include/uapi/linux/limits.h

linux-headers-4.19.0-041900rc8: /usr/src/linux-headers-4.19.0-041900rc8/include/linux/dynamic_queue_limits.h

linux-headers-4.19.0-041900rc8: /usr/src/linux-headers-4.19.0-041900rc8/arch/arm/include/asm/limits.h

libgcc-8-dev:amd64: /usr/lib/gcc/x86_64-linux-gnu/8/include-fixed/syslimits.h

Error:

    sudo pip3 install regex                   

The directory '/home/mac/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.

The directory '/home/mac/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.

Collecting regex

  Downloading https://files.pythonhosted.org/packages/9a/6f/8c1479c781bbc94394f9c4e33ad4139068bcc6a1b018c5a5525471262b8a/regex-2019.02.18.tar.gz (643kB)

    100% |████████████████████████████████| 645kB 813kB/s 

Installing collected packages: regex

  Running setup.py install for regex ... error

    Complete output from command /usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-n16bk3y6/regex/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('rn', 'n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-z1rqj4ab-record/install-record.txt --single-version-externally-managed --compile:

    /home/mac/.local/lib/python3.6/site-packages/setuptools/dist.py:475: UserWarning: Normalizing '2019.02.18' to '2019.2.18'

      normalized_version,

    running install

    running build

    running build_py

    creating build

    creating build/lib.linux-x86_64-3.6

    copying regex_3/regex.py -> build/lib.linux-x86_64-3.6

    copying regex_3/_regex_core.py -> build/lib.linux-x86_64-3.6

    copying regex_3/test_regex.py -> build/lib.linux-x86_64-3.6

    running build_ext

    building '_regex' extension

    creating build/temp.linux-x86_64-3.6

    creating build/temp.linux-x86_64-3.6/regex_3

    x86_64-linux-gnu-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/python3.6m -c regex_3/_regex.c -o build/temp.linux-x86_64-3.6/regex_3/_regex.o

    In file included from /usr/include/python3.6m/Python.h:11,

                     from regex_3/_regex.c:48:

    /usr/include/limits.h:124:26: error: no include path in which to search for limits.h

     # include_next <limits.h>

                              ^

    In file included from regex_3/_regex.c:48:

    /usr/include/python3.6m/Python.h:14:2: error: #error "Something's broken.  UCHAR_MAX should be defined in limits.h."

     #error "Something's broken.  UCHAR_MAX should be defined in limits.h."

      ^~~~~

    /usr/include/python3.6m/Python.h:18:2: error: #error "Python's source code assumes C's unsigned char is an 8-bit type."

     #error "Python's source code assumes C's unsigned char is an 8-bit type."

      ^~~~~

    In file included from /usr/include/python3.6m/Python.h:25,

                     from regex_3/_regex.c:48:

    /usr/include/stdio.h:33:10: fatal error: stddef.h: No such file or directory

     #include <stddef.h>

              ^~~~~~~~~~

    compilation terminated.

    error: command 'x86_64-linux-gnu-gcc' failed with exit status 1



    ----------------------------------------

Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-n16bk3y6/regex/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('rn', 'n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-z1rqj4ab-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-n16bk3y6/regex/