error installing postgresql-dev with python:3.8.2-alpine

[domdinicola]

using python:3.8.2-alpine I get unsatisfiable constraints when installing postgresql-dev
any advice?

Step 1/30 : FROM python:3.8.2-alpine as builder
 ---> d5e5ad4a4fc0
Step 2/30 : RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories
 ---> Using cache
 ---> f7e2e8d8c33a
Step 3/30 : RUN apk update
 ---> Using cache
 ---> 7893a9176908
Step 4/30 : RUN apk add --upgrade apk-tools
 ---> Using cache
 ---> 43554075b7c2
Step 5/30 : RUN apk add     --update alpine-sdk
 ---> Using cache
 ---> b193f988b3ce
Step 6/30 : RUN apk add postgresql-dev
 ---> Running in 530e765e6143
ERROR: unsatisfiable constraints:
  libffi-3.2.1-r6:
    conflicts: libffi-3.3-r2
    satisfies: llvm9-libs-9.0.0-r1[so:libffi.so.6]
               .python-rundeps-20200324.025755[so:libffi.so.6]
  libffi-3.3-r2:
    conflicts: libffi-3.2.1-r6
    satisfies: llvm10-libs-10.0.0-r2[so:libffi.so.7]
The command '/bin/sh -c apk add postgresql-dev' returned a non-zero code: 9
Makefile:11: recipe for target 'release' failed
make: *** [release] Error 9
``

[wglambert]

The edge repo's you're adding have libffi-3.3-r2, but it conflicts with the already installed libffi-3.2.1-r6 which is a dependency for Python

python/3.8/alpine3.11/Dockerfile

Line 50 in 6ceac80

libffi-dev \

Not using the edge repo works fine for installing postgresql-dev

Closing since this isn't an issue with the image and questions like these should be asked over at Docker Community Forums, Docker Community Slack, or Stack Overflow. Since these repos aren't really a user-help forum