Added a comment: Using stackage and installing

doc/news/version_5.20150528/comment_3_caaa61152a72d308cc2b27dcbf63df42._comment

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+[[!comment format=mdwn
+ username="https://me.yahoo.com/a/1NYxQEUZztr9TUg3dBoKbExvSbVs7HY-#43da1"
+ nickname="Bleddle"
+ subject="Using stackage and installing"
+ date="2015-05-30T18:06:00Z"
+ content="""
+@joey how do I use stackage when using `cabal install`. I tried putting the `cabal.config` into `~/.cabal` but still keep getting the same DAV dependency error.
+
+I also tried building on Debian after running:
+
+    cabal update; cabal unpack git-annex
+    sudo apt-get build-dep git-annex`
+
+Results:
+
+    ➤ cabal configure -v
+    /usr/bin/ghc --numeric-version
+    looking for tool \"ghc-pkg\" near compiler in /usr/bin
+    found ghc-pkg in /usr/bin/ghc-pkg
+    /usr/bin/ghc-pkg --version
+    /usr/bin/ghc --supported-languages
+    /usr/bin/ghc --info
+    Reading available packages...
+    Choosing modular solver.
+    Resolving dependencies...
+    Could not resolve dependencies:
+    trying: git-annex-5.20150528
+    trying: git-annex-5.20150528:+torrentparser
+    creating dist/setup
+    /usr/bin/ghc --make ./Setup.hs -o ./dist/setup/setup -odir ./dist/setup -hidir ./dist/setup -i -i. -package Cabal-1.18.1.3
+    <command line>: cannot satisfy -package Cabal-1.18.1.3
+        (use -v for more information)
+
+I'm not a Haskell programmer, so I have no idea how to get this all working, nor how to install a new version of git-annex.
+"""]]