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    You most likely updated GHC or something and so you have to
    reinstall all the packages you get errors for first:<br>
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    <pre>cabal install QuckCheck -reinstall --force-reinstalls
</pre>
    <br>
    <div class="moz-cite-prefix">Am 15.05.2015 um 09:10 schrieb Roelof
      Wobben:<br>
    </div>
    <blockquote cite="mid:55559BD7.5000706@home.nl" type="cite">
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      <div class="moz-cite-prefix">Another problem. <br>
        <br>
        I now see this output : <br>
        <br>
        <div>Preprocessing library digits-0.2...                                                                                      </div>
        <div>[1 of 1] Compiling Data.Digits      ( src/Data/Digits.hs, dist/build/Data/Digits.o )                                     </div>
        <div>/usr/bin/ld: cannot find -lHSQuickCheck-2.8.1-ghc7.8.3                                                                   </div>
        <div>/usr/bin/ld: cannot find -lHStf-random-0.5-ghc7.8.3                                                                      </div>
        <div>/usr/bin/ld: cannot find -lHSprimitive-0.6-ghc7.8.3                                                                      </div>
        <div>/usr/bin/ld: cannot find -lHStransformers-0.4.3.0-ghc7.8.3                                                               </div>
        <div>/usr/bin/ld: cannot find -lHSrandom-1.1-ghc7.8.3                                                                         </div>
        <div>collect2: error: ld returned 1 exit status                                                                               </div>
        <div>Failed to install digits-0.2                                                                                             </div>
        <div>cabal: Error: some packages failed to install:                                                                           </div>
        <div>digits-0.2 failed during the building phase. The exception was:                                                          </div>
        <div>ExitFailure 1                                                                                                            </div>
        <div>codio@switch-grille:~/workspace$ ghc                                                                                     </div>
        <div>ghc: no input files                                                                                                      </div>
        <div>Usage: For basic information, try the `--help' option.                                                                   </div>
        <div>codio@switch-grille:~/workspace$ ghc --version                                                                           </div>
        <div>The Glorious Glasgow Haskell Compilation System, version 7.8.3  

          <br>
          <br>
          Roelof<br>
          <br>
        </div>
        <br>
        <br>
        <br>
        Roelof Wobben schreef op 15-5-2015 om 9:08:<br>
      </div>
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        <div class="moz-cite-prefix">Thanks, <br>
          <br>
          And if I want to import it into my project , do I then do
          import Data.Digits ?<br>
          <br>
          Roelof<br>
          <br>
          <br>
          Alex Hammel schreef op 14-5-2015 om 23:25:<br>
        </div>
        <blockquote
cite="mid:CA+_xFerd9dN-mWzurH96EDDQS2bqSJYV76cFdX74dZeG030HRw@mail.gmail.com"
          type="cite">
          <div dir="ltr">
            <div>`Data.Digits` is the name of the module. The name of
              the package is `digits`. Therefore: $(cabal install
              digits)<br>
              <br>
            </div>
            `cabal` installs packages, which may contain many modules<br>
            <div>
              <div><br>
                <div class="gmail_quote">On Thu, 14 May 2015 at 14:14
                  Roelof Wobben <<a moz-do-not-send="true"
                    href="mailto:r.wobben@home.nl" target="_blank">r.wobben@home.nl</a>>


                  wrote:<br>
                  <blockquote class="gmail_quote" style="margin:0 0 0
                    .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,,<br>
                    <br>
                    I want to use the module Digits which according to
                    Hoogle is in Data.Digits<br>
                    <br>
                    But when I do cabal install Data.Digits I see this
                    error message :<br>
                    <br>
                    cabal install Data.Digits<br>
                    cabal: The file does not exist 'Data.Digits'<br>
                    <br>
                    What do I do wrong ?<br>
                    <br>
                    Roelof<br>
                    <br>
                    <br>
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