Work around failure to build on mips by using cabal, not Setup, to build in debian/rules.

debian/cabal-wrapper

@@ -0,0 +1,16 @@
+#!/bin/sh
+# It would be more usual to use:
+#   export CABAL=./Setup
+# But Setup currently has a very bad dependency resolver, and very bad
+# debugging output, and tends to eat all memory and die on small buildds.
+#
+# This should be revisited once Debian has a newer ghc than 7.6.3,
+# and hopefully gets the improved dependency resolver from cabal.
+set -e
+
+# Avoid cabal writing to HOME, and avoid local cabal settings
+# influencing the build.
+HOME=$(mktemp -d)
+export HOME
+
+cabal "$@"

debian/changelog

@@ -1,6 +1,8 @@
 git-annex (5.20140920) UNRELEASED; urgency=medium
 
   * Depend on new enough git for --no-gpg-sign to work. Closes: #762446
+  * Work around failure to build on mips by using cabal, not Setup,
+    to build in debian/rules.
 
  -- Joey Hess <joeyh@debian.org>  Mon, 22 Sep 2014 13:50:00 -0400
 

debian/control

@@ -4,6 +4,7 @@ Priority: optional
 Build-Depends: 
 	debhelper (>= 9),
 	ghc (>= 7.4),
+	cabal-install,
 	libghc-mtl-dev (>= 2.1.1),
 	libghc-missingh-dev,
 	libghc-data-default-dev,

debian/rules

@@ -1,7 +1,6 @@
 #!/usr/bin/make -f
 
-# Avoid using cabal, as it writes to $HOME
-export CABAL=./Setup
+export CABAL=debian/cabal-wrapper
 
 # Do use the changelog's version number, rather than making one up.
 export RELEASE_BUILD=1