Flask quickstart error: command 'g++' failed: No such file or directory greenlet #56
Description
Is your feature request related to a problem? Please describe.
Problem: flask quickstart project deploy job fails to build due to greenlet change in build requirements
14.17 running build_ext
14.17 building 'greenlet._greenlet' extension
14.17 creating build/temp.linux-x86_64-cpython-314/src/greenlet
14.17 g++ -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall -fPIC -I/usr/local/include/python3.14 -c src/greenlet/greenlet.cpp -o build/temp.linux-x86_64-cpython-314/src/greenlet/greenlet.o
14.17 error: command 'g++' failed: No such file or directory
14.17 [end of output]
14.17
14.17 note: This error originates from a subprocess, and is likely not a problem with pip.
14.18 ERROR: Failed building wheel for greenlet
14.18 Failed to build greenlet
14.36
14.36 [notice] A new release of pip is available: 25.2 -> 25.3
14.36 [notice] To update, run: pip install --upgrade pip
14.36 error: failed-wheel-build-for-install
14.36
14.36 × Failed to build installable wheels for some pyproject.toml based projects
14.36 ╰─> greenlet
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Dockerfile:6
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4 | WORKDIR /usr/src/app
5 | COPY requirements.txt /usr/src/app/
6 | >>> RUN pip install -U -r requirements.txt
7 | COPY ./web /usr/src/app/
8 | COPY ./entrypoint.sh /
Describe the solution you'd like
Build should build out of box as before..
Describe alternatives you've considered
Additional context
( #55 related end result- different cause)