title: Docker Alpine linux package masked
body: <p>I am trying to install a package on my docker image that runs alpine but I get the following error,</p>
  
  <pre><code>Removing intermediate container 54bbe0932899
  Step 14 : RUN apk add openblas openblas-dev --update-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted
   ---&gt; Running in 24d7a8c00c89
  fetch http://dl-3.alpinelinux.org/alpine/edge/testing/x86_64/APKINDEX.tar.gz
  fetch http://dl-cdn.alpinelinux.org/alpine/v3.4/main/x86_64/APKINDEX.tar.gz
  fetch http://dl-cdn.alpinelinux.org/alpine/edge/testing/x86_64/APKINDEX.tar.gz
  fetch http://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz
  ERROR: unsatisfiable constraints:
    openblas-0.2.19-r0:
      masked in: @community
      satisfies: world[openblas]
                 openblas-dev-0.2.19-r0[openblas=0.2.19-r0]
    openblas-ilp64-0.2.19-r0:
      masked in: @community
      satisfies:
                 openblas-dev-0.2.19-r0[openblas-ilp64=0.2.19-r0]
    openblas-dev-0.2.19-r0:
      masked in: @community
      satisfies: world[openblas-dev]
  ERROR: Service 'web' failed to build: The command '/bin/sh -c apk add openblas openblas-dev --update-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted' returned a non-zero code: 3
  </code></pre>
  
  <p>Important part of the <code>Dockerfile</code>:</p>
  
  <pre><code>FROM python:3.5.2-alpine
  
  ADD repositories /etc/apk/repositories
  
  RUN apk upgrade --update
  RUN apk add --update libstdc++ curl ca-certificates bash
  RUN apk add openblas openblas-dev --update-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing/ --allow-untrusted
  RUN apk add --update py-scipy py-numpy py-numpy-dev
  </code></pre>
  
  <p>The repository file is</p>
  
  <pre><code>http://dl-cdn.alpinelinux.org/alpine/v3.4/main
  @testing http://dl-cdn.alpinelinux.org/alpine/edge/testing
  @community http://dl-cdn.alpinelinux.org/alpine/edge/community
  </code></pre>
  
  <p>How I can force the installation of <code>openblas</code>?</p>
  
  <p>I am new to alpine so apologies if this is a straight forward question.</p>