custom_rules.xml

<?xml version="1.0" encoding="UTF-8"?>
<project name="HaskellActivity_custom_rules" default="help">

  <target name="-pre-compile" >
    <uptodate property="cabal-x86-configure.notRequired"
              targetfile="obj/local/x86/setup-config" >
      <srcfiles dir="." includes="*.cabal"/>
    </uptodate>
    <uptodate property="cabal-armeabi-configure.notRequired"
              targetfile="obj/local/armeabi/setup-config" >
      <srcfiles dir="." includes="*.cabal"/>
    </uptodate>
  </target>

  <target name="cabal-x86-configure" unless="cabal-x86-configure.notRequired">
    <exec executable="i686-linux-android-cabal" failonerror="true">
      <arg value="configure" />
      <arg value="--builddir=obj/local/x86" />
    </exec>
  </target>

  <target name="cabal-armeabi-configure" unless="cabal-armeabi-configure.notRequired">
    <exec executable="arm-linux-androideabi-cabal" failonerror="true">
      <arg value="configure" />
      <arg value="--builddir=obj/local/armeabi" />
    </exec>
  </target>

  <target name="-post-compile" depends="cabal-x86-configure,cabal-armeabi-configure">

    <exec executable="i686-linux-android-cabal" failonerror="true">
      <arg value="build" />
      <arg value="--builddir=obj/local/x86" />
    </exec>

    <exec executable="arm-linux-androideabi-cabal" failonerror="true">
      <arg value="build" />
      <arg value="--builddir=obj/local/armeabi" />
    </exec>

    <exec executable="${ndk.dir}/ndk-build" failonerror="true"/>
  </target>

  <target name="clean" depends="android_rules.clean">

    <exec executable="${ndk.dir}/ndk-build" failonerror="true">
      <arg value="clean"/>
    </exec>

    <exec executable="i686-linux-android-cabal" failonerror="true">
      <arg value="clean" />
      <arg value="--builddir=obj/local/x86" />
    </exec>

    <exec executable="arm-linux-androideabi-cabal" failonerror="true">
      <arg value="clean" />
      <arg value="--builddir=obj/local/armeabi" />
    </exec>

  </target>

</project>