title: Alpine unsatisfiable constraints: missing packages
body: <p>I am trying to create a docker image based on <code>alpine:3.7</code>, but I get errors while installing some packages with <code>apk add</code>.</p>
  
  <p>Example:</p>
  
  <pre><code>ERROR: unsatisfiable constraints:
    apache2-suexec (missing):
      required by: world[apache2-suexec-custom]
    host (missing):
      required by: world[host]
    lpr (missing):
      required by: world[lpr]
    time (missing):
      required by: world[time]
  </code></pre>
  
  <p>The cause is that these packages do not exist in alpine repositories yet. How can I solve these issues? Is there any repository from which I can download them?</p>
  
  <p>I'm using this line</p>
  
  <pre><code>FROM alpine:3.7
  
  RUN apk update \
      &amp;&amp; apk upgrade \
      &amp;&amp; apk --no-cache add --update tcl apache2 apache2-suexec ca-certificates \ 
      apk-tools curl build-base supervisor lpr time dcron host rsync libxml2-utils libxslt
  </code></pre>