error: kivent_core/entity.c: No such file or directory

[SBAndrei]

I tried to follow these instructions: https://github.com/kivy/kivent#installation
Each and every one of them failed, saying that there are missing files. Ex:
$ python setup.py build_ext install
...
x86_64-linux-gnu-gcc: error: kivent_core/entity.c: No such file or directory
x86_64-linux-gnu-gcc: fatal error: no input files
compilation terminated.
error: command 'x86_64-linux-gnu-gcc' failed with exit status 1

I am using these specs:
NAME="Ubuntu"
VERSION="20.04.2 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.2 LTS"
VERSION_ID="20.04"

Welp pls! this project seems so nice for 2D cross-platform games. Thanks in advance :)

[dlwalter]

Is cython installed?

python -m pip install cython

[coz-eduardo-hernandez]

Had this same issue, indeed it was that cython was not installed. It may seem obvious to people who have worked for a while with the python, kivy or kivent, but for newcomers is not.

Ideally both python (with the supported versions) and cython should be listed at https://github.com/kivy/kivent#dependencies .