title: composer why-not is not helpful - why can I not install this package
body: <p>I can not require the following package in a contao project.</p>
  
  <pre><code>$ php composer.phar require -v con4gis/con4gis_forum
  Using version ^1.7 for con4gis/con4gis_forum
  ./composer.json has been updated
  Loading composer repositories with package information
  Updating dependencies (including require-dev)
  Dependency resolution completed in 0.026 seconds
  Your requirements could not be resolved to an installable set of packages.
  
    Problem 1
      - Conclusion: don't install con4gis/con4gis_forum v1.7.1
      - Installation request for con4gis/con4gis_forum ^1.7 -&gt; satisfiable by con4gis/con4gis_forum[v1.7.0, v1.7.1].
      - con4gis/con4gis_forum v1.7.0 requires con4gis/con4gis_core ~1.7 -&gt; satisfiable by con4gis/con4gis_core[v1.7.0, v1.7.1].
      - con4gis/con4gis_core v1.7.0 requires menatwork/contao-multicolumnwizard 3.3.8 -&gt; satisfiable by menatwork/contao-multicolumnwizard[3.3.8].
      - con4gis/con4gis_core v1.7.1 requires menatwork/contao-multicolumnwizard 3.3.8 -&gt; satisfiable by menatwork/contao-multicolumnwizard[3.3.8].
      - Conclusion: don't install menatwork/contao-multicolumnwizard 3.3.8
  
  
  $ php composer.phar why-not menatwork/contao-multicolumnwizard
  contao-legacy/semantic_html5      1.1.7.9014    requires  contao-legacy/multicolumnwizard (&gt;=3.0.0,&lt;4.0.0-dev)  
  metamodels/attribute_alias        2.0.0-alpha2  requires  menatwork/contao-multicolumnwizard (~3.3)             
  metamodels/core                   2.0.0-alpha9  requires  menatwork/contao-multicolumnwizard (~3.3)             
  psi/news4ward                     2.2.3         requires  menatwork/contao-multicolumnwizard (~3)               
  terminal42/contao-changelanguage  3.1.0         requires  menatwork/contao-multicolumnwizard (^3.3)     
  </code></pre>
  
  <p>I checked all the requires printed from why not and 3.3.8 is already green, i.e. satisfied on <a href="https://semver.mwl.be/#?package=menatwork%2Fcontao-multicolumnwizard&amp;version=%5E3.3&amp;minimum-stability=stable" rel="nofollow noreferrer">https://semver.mwl.be/#?package=menatwork%2Fcontao-multicolumnwizard&amp;version=%5E3.3&amp;minimum-stability=stable</a></p>
  
  <p>What is going on?</p>
  
  <p>Deleting the <code>composer.lock</code> also did not help.</p>
  
  <p>Composer version is latest stable.</p>
  
  <p>Composer.json</p>
  
  <pre><code>{
      "name": "local/website",
      "description": "A local website project",
      "type": "project",
      "license": "proprietary",
      "require": {
      "cgo-it/news4ward-rateit": "dev-master",
      "contao-legacy/ce_page_teaser": "~1.5",
      "contao-legacy/efg": "&gt;=2.2.1.9005,&lt;2.3-dev",
      "contao-legacy/om_searchkeys": "~1.0",
      "contao-legacy/rocksolid-columns": "&gt;=1.0.6.9006,&lt;1.1-dev",
      "contao-legacy/semantic_html5": "&gt;=1.1.7.9014,&lt;1.2-dev",
      "contao-legacy/survey_ce": "3.0.2.9003",
      "imi/imi_mm_changelanguage": "*",
      "jakeasmith/http_build_url": "^1",
      "madeyourday/contao-rocksolid-columns": "&gt;=1.0.7.0,&lt;1.1-dev",
      "metamodels/bundle_all": "dev-master",
      "phpoffice/phpexcel": "dev-master",
      "psi/news4ward": "&gt;=2.2.3.0,&lt;2.3-dev",
      "psi/news4ward_archive-menu": "2.0.8",
      "psi/news4ward_author-menu": "2.0.2",
      "psi/news4ward_comments": "2.1.0",
      "psi/news4ward_metatitle": "dev-master#d2c09fb47441c05011ddcc5b08e54aae138a8ab7",
      "psi/news4ward_mostread": "2.1.0",
      "psi/news4ward_multicategories": "1.0.5",
      "psi/news4ward_related": "2.1.0",
      "psi/news4ward_tags": "2.1.1",
      "contao-community-alliance/dc-general": "^2.0.0-beta32",
      "querypath/QueryPath": "^3.0",
      "terminal42/contao-changelanguage": "^3.1",
      "contao-community-alliance/composer-client": "~0.14",
      "delahaye/dlh_googlemaps": "^2.2",
      "contao-legacy/inputvar": "1.1.1.9048"
      },
      "prefer-stable": true,
      "minimum-stability": "dev",
      "config": {
      "preferred-install": "dist",
      "cache-dir": "cache",
      "component-dir": "../assets/components"
      },
      "repositories": [
      {
          "type": "artifact",
          "url": "packages"
      },
      {
          "type": "composer",
          "url": "https://legacy-packages-via.contao-community-alliance.org/"
      }
      ],
      "extra": {
      "contao": {
          "migrated": "done"
      }
      }
  }
  </code></pre>