Just remove the .ghc. No need to touch .cabal. <span></span><br><br>On Friday, November 29, 2013, Thiago Negri  wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">I did the easy way and it worked!<div><div>The bad thing is that after restarting my laptop, xmonad and xmobar were gone.</div><div>I recompiled xmonad and it&#39;s ok, but xmobar is failing to build because &quot;unix&quot; package is failing because &quot;Signals.h&quot; is missing (used by System.Posix.Signals).</div>


<div>:-(</div><div><br></div></div><div>I guess my cabal environment is messed up.<br></div><div>Is `rm -rf ~/.ghc ~/.cabal` supposed to reset cabal installation?</div><div>How do I start a fresh cabal environment?</div>

<div>
<br></div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/11/26 Clark Gaebel <span dir="ltr">&lt;<a href="javascript:_e({}, &#39;cvml&#39;, &#39;cgaebel@uwaterloo.ca&#39;);" target="_blank">cgaebel@uwaterloo.ca</a>&gt;</span><br>


<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">You&#39;ve got two options:<br><br></div>


<div class="gmail_default" style="font-family:verdana,sans-serif">1) (the easy way)<br><br>rm -rf ~/.ghc ~/.cabal<br>

</div><div class="gmail_default" style="font-family:verdana,sans-serif">cabal update<br>cabal install scotty<br><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">2) (the hard way, ghc 7.6+ only)<br>




<br>Use a sandbox!<br><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">cd path/to/my/project/that/uses/scotty<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">cabal sandbox init<br>




cabal install --only-dependencies -j # make sure scotty is a dependency of your project<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">cabal configure<br></div><div class="gmail_default" style="font-family:verdana,sans-serif">




cabal build<br><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">3) use cabal-dev. similar to using sandboxes, but I don&#39;t have it any more so can&#39;t give you a step-by-step.<br></div></div>




<div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>On Tue, Nov 26, 2013 at 7:34 PM, Thiago Negri <span dir="ltr">&lt;<a href="javascript:_e({}, &#39;cvml&#39;, &#39;evohunz@gmail.com&#39;);" target="_blank">evohunz@gmail.com</a>&gt;</span> wrote:<br>


</div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div>

<div dir="ltr"><div>I don&#39;t know what to do. :-(</div><div>I can&#39;t install scotty or yesod.</div><div><br></div><div>$ cabal install scotty</div><div>cabal: Could not resolve dependencies:</div><div>trying: scotty-0.5.0 (user goal)</div>






<div>trying: base-4.7.0.0/installed-dc1... (dependency of scotty-0.5.0)</div><div>trying: wai-extra-1.3.4.6 (dependency of scotty-0.5.0)</div><div>trying: stringsearch-0.3.6.4 (dependency of wai-extra-1.3.4.6)</div><div>





rejecting: stringsearch-0.3.6.4:-base3 (conflict:</div>
<div>base==<a href="http://4.7.0.0/installed-dc1.." target="_blank">4.7.0.0/installed-dc1..</a>., stringsearch-0.3.6.4:base3 =&gt; base&gt;=2 &amp;&amp; &lt;3)</div><div>rejecting: stringsearch-0.3.6.4:+base3 (conflict:</div>




<div>base==<a href="http://4.7.0.0/installed-dc1.." target="_blank">4.7.0.0/installed-dc1..</a>., stringsearch-0.3.6.4:base3 =&gt; base&gt;=3 &amp;&amp; &lt;4)</div>

<div>Backjump limit reached (change with --max-backjumps).</div><div><br></div></div>
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<br></blockquote></div><span><font color="#888888"><br><br clear="all"><br>-- <br><div dir="ltr">Clark.<br><br><span style="font-family:courier new,monospace"><span style="color:rgb(153,153,153)"><font size="1">Key ID     : 0x78099922<br>


Fingerprint: B292 493C 51AE F3AB D016  DD04 E5E3 C36F 5534 F907</font></span></span></div>


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