plotnine compilation issue in Python 3.7

I am not sure about the following error that I get when trying to install plotnine in the environment of Python 3.7. Do I miss a pre-requirement or is this issue related with the one describe here, which caused by an old cython version that was used for the build?: https://github.com/pandas-dev/pandas/issues/21785

sudo pip install plotnine

...PRUNED BY ME...

    In file included from /usr/include/python3.7m/Python.h:128,
                     from _proj.c:4:
    /usr/include/python3.7m/abstract.h:500:17: note: declared here
     PyAPI_FUNC(int) PyObject_AsWriteBuffer(PyObject *obj,
                     ^~~~~~~~~~~~~~~~~~~~~~
    _proj.c: In function ‘__Pyx_ExceptionSave’:
    _proj.c:7421:21: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_type’; did you mean ‘curexc_type’?
         *type = tstate->exc_type;
                         ^~~~~~~~
                         curexc_type
    _proj.c:7422:22: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_value’; did you mean ‘curexc_value’?
         *value = tstate->exc_value;
                          ^~~~~~~~~
                          curexc_value
    _proj.c:7423:19: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_traceback’; did you mean ‘curexc_traceback’?
         *tb = tstate->exc_traceback;
                       ^~~~~~~~~~~~~
                       curexc_traceback
    _proj.c: In function ‘__Pyx_ExceptionReset’:
    _proj.c:7435:24: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_type’; did you mean ‘curexc_type’?
         tmp_type = tstate->exc_type;
                            ^~~~~~~~
                            curexc_type
    _proj.c:7436:25: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_value’; did you mean ‘curexc_value’?
         tmp_value = tstate->exc_value;
                             ^~~~~~~~~
                             curexc_value
    _proj.c:7437:22: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_traceback’; did you mean ‘curexc_traceback’?
         tmp_tb = tstate->exc_traceback;
                          ^~~~~~~~~~~~~
                          curexc_traceback
    _proj.c:7438:13: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_type’; did you mean ‘curexc_type’?
         tstate->exc_type = type;
                 ^~~~~~~~
                 curexc_type
    _proj.c:7439:13: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_value’; did you mean ‘curexc_value’?
         tstate->exc_value = value;
                 ^~~~~~~~~
                 curexc_value
    _proj.c:7440:13: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_traceback’; did you mean ‘curexc_traceback’?
         tstate->exc_traceback = tb;
                 ^~~~~~~~~~~~~
                 curexc_traceback
    _proj.c: In function ‘__Pyx_GetException’:
    _proj.c:7483:24: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_type’; did you mean ‘curexc_type’?
         tmp_type = tstate->exc_type;
                            ^~~~~~~~
                            curexc_type
    _proj.c:7484:25: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_value’; did you mean ‘curexc_value’?
         tmp_value = tstate->exc_value;
                             ^~~~~~~~~
                             curexc_value
    _proj.c:7485:22: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_traceback’; did you mean ‘curexc_traceback’?
         tmp_tb = tstate->exc_traceback;
                          ^~~~~~~~~~~~~
                          curexc_traceback
    _proj.c:7486:13: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_type’; did you mean ‘curexc_type’?
         tstate->exc_type = local_type;
                 ^~~~~~~~
                 curexc_type
    _proj.c:7487:13: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_value’; did you mean ‘curexc_value’?
         tstate->exc_value = local_value;
                 ^~~~~~~~~
                 curexc_value
    _proj.c:7488:13: error: ‘PyThreadState’ {aka ‘struct _ts’} has no member named ‘exc_traceback’; did you mean ‘curexc_traceback’?
         tstate->exc_traceback = local_tb;
                 ^~~~~~~~~~~~~
                 curexc_traceback
    error: command 'gcc' failed with exit status 1

Thanks for any help. And keep up the great project, I am a happy user of plotnine for more than a year.

[aflueckiger]

@has2k1 Thanks for your answer. After some research and fiddling around I assume the issue is caused by the package pyproj, which is a dependency of geopandas, which is itself a dependency of plotnine. Any attempt to directly install pyproj fails because it probably uses old, precompiled cython files (see https://github.com/jswhit/pyproj/issues/136).

The simple solution is to install plotnine without further dependencies (i.e. pyproj) using the following command: pip install -U --no-deps plotnine

[has2k1]

@jorisvandenbossche, thank you for the advice, I will do as suggested.