This patch is required for xmonad to make use of shared libraries.
Without it, xmonad will not work since we do not (by default) use
statically linked Haskell libraries.

diff -ruN xmonad-0.15-a/src/XMonad/Core.hs xmonad-0.15-b/src/XMonad/Core.hs
--- xmonad-0.15-a/src/XMonad/Core.hs	1969-12-31 19:00:00.000000000 -0500
+++ xmonad-0.15-b/src/XMonad/Core.hs	1969-12-31 19:00:00.000000000 -0500
@@ -681,6 +681,8 @@
        compileGHC bin dir errHandle =
          runProcess "ghc" ["--make"
                           , "xmonad.hs"
+                          , "-dynamic"
+                          , "-fPIC"
                           , "-i"
                           , "-ilib"
                           , "-fforce-recomp"
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<div class='path'>path: <a href='/guix/log/?id=fe75dc2552ddabafcc07701c01dea56f4c527a70'>root</a>/<a href='/guix/log/tests?id=fe75dc2552ddabafcc07701c01dea56f4c527a70'>tests</a>/<a href='/guix/log/tests/base32.scm?id=fe75dc2552ddabafcc07701c01dea56f4c527a70'>base32.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/base32.scm?id=fe75dc2552ddabafcc07701c01dea56f4c527a70&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-08-29 16:24:17 +0200'>2020-08-29</span></td><td><a href='/guix/commit/tests/base32.scm?id=d7965b58d25c9c7648ba5682223f32d759fdffda'>build: Remove references to the 'nix-hash' program.</a><span class='msg-avail'>...<span class='msg-tooltip'>* configure.ac: Remove check for 'nix-hash'.
* tests/base32.scm (%nix-hash, %have-nix-hash?): Remove.
("sha256 &amp; bytevector-&gt;nix-base32-string"): Remove test.
* build-aux/pre-inst-env.in: Do not set 'NIX_HASH' environment
variable.
</span></span></td><td>Ludovic Courtès</td></tr>