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    <p>Thanks Sandy, it seems like that did the job<br>
    </p>
    <div class="moz-cite-prefix">Am 23.08.19 um 18:04 schrieb Sandy
      Maguire:<br>
    </div>
    <blockquote type="cite"
cite="mid:CADRtjwbNYnqFomG-QJBqOD3tb=dXcHvnPuMhERTtcQtmxcckFQ@mail.gmail.com">
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      <div dir="ltr">Sometimes I see this if I forget to add a file to
        the `exposed-modules` field of the cabal file. You might be
        running into that?</div>
      <br>
      <div class="gmail_quote">
        <div dir="ltr" class="gmail_attr">On Fri, Aug 23, 2019 at 10:03
          AM Jan van Brügge <<a href="mailto:jan@vanbruegge.de"
            moz-do-not-send="true">jan@vanbruegge.de</a>> wrote:<br>
        </div>
        <blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">Hi,<br>
          <br>
          in order to clean up my code, I've moved a bunch of stuff to a
          new<br>
          source file, `TcRowTys.hs` that works similar to
          `TcTypeNats.hs`. But<br>
          when trying to compile a clean build of GHC, I get a linker
          error:<br>
          <br>
          ```<br>
          <br>
          | Run Ghc LinkHs Stage0: _build/stage0/ghc/build/c/hschooks.o
          (and 1<br>
          more) => _build/stage0/bin/ghc<br>
_build/stage0/lib/../lib/x86_64-linux-ghc-8.6.5/ghc-8.9.0.20190722/libHSghc-8.9.0.20190722.a(PrelInfo.o)(.text+0x2814):<br>
          error: undefined reference to 'ghc_TcRowTys_rowTyCons_closure'<br>
_build/stage0/lib/../lib/x86_64-linux-ghc-8.6.5/ghc-8.9.0.20190722/libHSghc-8.9.0.20190722.a(PrelInfo.o)(.data+0x578):<br>
          error: undefined reference to 'ghc_TcRowTys_rowTyCons_closure'<br>
_build/stage0/lib/../lib/x86_64-linux-ghc-8.6.5/ghc-8.9.0.20190722/libHSghc-8.9.0.20190722.a(TcHsType.o)(.data+0xdd8):<br>
          error: undefined reference to 'ghc_TcRowTys_rnilTyCon_closure'<br>
          collect2: Fehler: ld gab 1 als Ende-Status zurück<br>
          `gcc' failed in phase `Linker'. (Exit code: 1)<br>
          <br>
          ```<br>
          <br>
          I had a look at the Wiki including the FAQ, but did not fine
          anything<br>
          about that topic. Does someone know what I have to do for this
          to work?<br>
          <br>
          Cheers,<br>
          Jan<br>
          <br>
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      <div><br>
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      -- <br>
      <div dir="ltr" class="gmail_signature">
        <div dir="ltr">
          <div>I'm currently traveling the world, sleeping on people's
            couches and doing full-time collaboration on Haskell
            projects. If this seems interesting to you, please consider
            signing up as a host! <a
              href="https://isovector.github.io/erdos/" target="_blank"
              moz-do-not-send="true">https://isovector.github.io/erdos/</a><br>
          </div>
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