diff --git a/.travis.yml b/.travis.yml
index 8aa53e060..ff13213b9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,266 @@
-language: haskell
-ghc:
-  - 8.6
+###############################################################################
+# To see the local changes made to this file, run:
+#
+# $ curl -sS https://raw.githubusercontent.com/commercialhaskell/stack/0cbcce0b1b89e5431121b745afdd1dfbd3ba8a43/doc/travis-complex.yml | diff -u - .travis.yml
+###############################################################################
+
+# This is the complex Travis configuration, which is intended for use
+# on open source libraries which need compatibility across multiple GHC
+# versions, must work with cabal-install, and should be
+# cross-platform. For more information and other options, see:
+#
+# https://docs.haskellstack.org/en/stable/travis_ci/
+#
+# Copy these contents into the root directory of your Github project in a file
+# named .travis.yml
+
+# Run jobs on Linux unless "os" is specified explicitly.
+os: linux
+
+# Do not choose a language; we provide our own build tools.
+language: generic
+
+# Caching so the next build will be fast too.
+cache:
+  directories:
+  - $HOME/.ghc
+  - $HOME/.cabal
+  - $HOME/.stack
+  - $TRAVIS_BUILD_DIR/.stack-work
+
+# The different configurations we want to test. We have BUILD=cabal which uses
+# cabal-install, and BUILD=stack which uses Stack. More documentation on each
+# of those below.
+#
+# We set the compiler values here to tell Travis to use a different
+# cache file per set of arguments.
+#
+# If you need to have different apt packages for each combination in the
+# job matrix, you can use a line such as:
+#     addons: {apt: {packages: [libfcgi-dev,libgmp-dev]}}
+jobs:
+  include:
+  # We grab the appropriate GHC and cabal-install versions from hvr's PPA. See:
+  # https://github.com/hvr/multi-ghc-travis
+  #- env: BUILD=cabal GHCVER=7.0.4 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.0.4"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.0.4,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.2.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.2.2"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.2.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.4.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.4.2"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.4.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.6.3 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.6.3"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.8.4 CABALVER=1.18 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.8.4"
+  #  addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.10.3 CABALVER=1.22 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.10.3"
+  #  addons: {apt: {packages: [cabal-install-1.22,ghc-7.10.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=8.0.2 CABALVER=1.24 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 8.0.2"
+  #  addons: {apt: {packages: [cabal-install-1.24,ghc-8.0.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=8.2.2 CABALVER=2.0 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 8.2.2"
+  #  addons: {apt: {packages: [cabal-install-2.0,ghc-8.2.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=8.4.4 CABALVER=2.2 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 8.4.4"
+  #  addons: {apt: {packages: [cabal-install-2.2,ghc-8.4.4,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=8.6.5 CABALVER=2.4 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 8.6.5"
+  #  addons: {apt: {packages: [cabal-install-2.4,ghc-8.6.5,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+
+  # Build with the newest GHC and cabal-install. This is an accepted failure,
+  # see below.
+  #- env: BUILD=cabal GHCVER=head  CABALVER=head HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC HEAD"
+  #  addons: {apt: {packages: [cabal-install-head,ghc-head,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+
+  # The Stack builds. We can pass in arbitrary Stack arguments via the ARGS
+  # variable, such as using --stack-yaml to point to a different file.
+  #- env: BUILD=stack ARGS=""
+  #  compiler: ": #stack default"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  #- env: BUILD=stack ARGS="--resolver lts-2"
+  #  compiler: ": #stack 7.8.4"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  #- env: BUILD=stack ARGS="--resolver lts-3"
+  #  compiler: ": #stack 7.10.2"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  #- env: BUILD=stack ARGS="--resolver lts-6"
+  #  compiler: ": #stack 7.10.3"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  #- env: BUILD=stack ARGS="--resolver lts-7"
+  #  compiler: ": #stack 8.0.1"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  #- env: BUILD=stack ARGS="--resolver lts-9"
+  #  compiler: ": #stack 8.0.2"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  #- env: BUILD=stack ARGS="--resolver lts-11"
+  #  compiler: ": #stack 8.2.2"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  #- env: BUILD=stack ARGS="--resolver lts-12"
+  #  compiler: ": #stack 8.4.4"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  - env: BUILD=stack ARGS="--resolver lts-14"
+    compiler: ": #stack 8.6.5"
+    addons: {apt: {packages: [libgmp-dev]}}
+
+  - env: BUILD=stack ARGS="--resolver lts-15"
+    compiler: ": #stack 8.8.2"
+    addons: {apt: {packages: [libgmp-dev]}}
+
+  # Nightly builds are allowed to fail
+  #- env: BUILD=stack ARGS="--resolver nightly"
+  #  compiler: ": #stack nightly"
+  #  addons: {apt: {packages: [libgmp-dev]}}
+
+  # Build on macOS in addition to Linux
+  #- env: BUILD=stack ARGS=""
+  #  compiler: ": #stack default osx"
+  #  os: osx
+
+  # Travis includes an macOS which is incompatible with GHC 7.8.4
+  #- env: BUILD=stack ARGS="--resolver lts-2"
+  #  compiler: ": #stack 7.8.4 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver lts-3"
+  #  compiler: ": #stack 7.10.2 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver lts-6"
+  #  compiler: ": #stack 7.10.3 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver lts-7"
+  #  compiler: ": #stack 8.0.1 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver lts-9"
+  #  compiler: ": #stack 8.0.2 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver lts-11"
+  #  compiler: ": #stack 8.2.2 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver lts-12"
+  #  compiler: ": #stack 8.4.4 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver lts-14"
+  #  compiler: ": #stack 8.6.5 osx"
+  #  os: osx
+
+  #- env: BUILD=stack ARGS="--resolver nightly"
+  #  compiler: ": #stack nightly osx"
+  #  os: osx
+
+  allow_failures:
+  - env: BUILD=cabal GHCVER=head  CABALVER=head HAPPYVER=1.19.5 ALEXVER=3.1.7
+  - env: BUILD=stack ARGS="--resolver nightly"
+
+before_install:
+# Using compiler above sets CC to an invalid value, so unset it
+- unset CC
+
+# We want to always allow newer versions of packages when building on GHC HEAD
+- CABALARGS=""
+- if [ "x$GHCVER" = "xhead" ]; then CABALARGS=--allow-newer; fi
+
+# Download and unpack the stack executable
+- export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:$HOME/.local/bin:/opt/alex/$ALEXVER/bin:/opt/happy/$HAPPYVER/bin:$HOME/.cabal/bin:$PATH
+- mkdir -p ~/.local/bin
+- |
+  if [ `uname` = "Darwin" ]
+  then
+    travis_retry curl --insecure -L https://get.haskellstack.org/stable/osx-x86_64.tar.gz | tar xz --strip-components=1 --include '*/stack' -C ~/.local/bin
+  else
+    travis_retry curl -L https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
+  fi
+
+  # Use the more reliable S3 mirror of Hackage
+  mkdir -p $HOME/.cabal
+  echo 'remote-repo: hackage.haskell.org:http://hackage.fpcomplete.com/' > $HOME/.cabal/config
+  echo 'remote-repo-cache: $HOME/.cabal/packages' >> $HOME/.cabal/config
+
+
+install:
+- echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
+- if [ -f configure.ac ]; then autoreconf -i; fi
+- |
+  set -ex
+  case "$BUILD" in
+    stack)
+      # Add in extra-deps for older snapshots, as necessary
+      #
+      # This is disabled by default, as relying on the solver like this can
+      # make builds unreliable. Instead, if you have this situation, it's
+      # recommended that you maintain multiple stack-lts-X.yaml files.
+
+      #stack --no-terminal --install-ghc $ARGS test --bench --dry-run || ( \
+      #  stack --no-terminal $ARGS build cabal-install && \
+      #  stack --no-terminal $ARGS solver --update-config)
+
+      # Build the dependencies
+      stack --no-terminal --install-ghc $ARGS test --bench --only-dependencies
+      ;;
+    cabal)
+      cabal --version
+      travis_retry cabal update
+
+      # Get the list of packages from the stack.yaml file. Note that
+      # this will also implicitly run hpack as necessary to generate
+      # the .cabal files needed by cabal-install.
+      PACKAGES=$(stack --install-ghc query locals | grep '^ *path' | sed 's@^ *path:@@')
+
+      cabal install --only-dependencies --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
+      ;;
+  esac
+  set +ex
+
+script:
+- |
+  set -ex
+  case "$BUILD" in
+    stack)
+      stack --no-terminal $ARGS test --bench --no-run-benchmarks --haddock --no-haddock-deps
+      ;;
+    cabal)
+      cabal install --enable-tests --enable-benchmarks --force-reinstalls --ghc-options=-O0 --reorder-goals --max-backjumps=-1 $CABALARGS $PACKAGES
+
+      ORIGDIR=$(pwd)
+      for dir in $PACKAGES
+      do
+        cd $dir
+        cabal check || [ "$CABALVER" == "1.16" ]
+        cabal sdist
+        PKGVER=$(cabal info . | awk '{print $2;exit}')
+        SRC_TGZ=$PKGVER.tar.gz
+        cd dist
+        tar zxfv "$SRC_TGZ"
+        cd "$PKGVER"
+        cabal configure --enable-tests --ghc-options -O0
+        cabal build
+        if [ "$CABALVER" = "1.16" ] || [ "$CABALVER" = "1.18" ]; then
+          cabal test
+        else
+          cabal test --show-details=streaming --log=/dev/stdout
+        fi
+        cd $ORIGDIR
+      done
+      ;;
+  esac
+  set +ex
diff --git a/README.md b/README.md
index 9d5bb51b2..04ab37055 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 The Haskell Standard Library -- Random Number Generation
 ========================================================
-[![Build Status](https://secure.travis-ci.org/haskell/random.svg?branch=master)](http://travis-ci.org/haskell/random)
+[![Build Status](https://secure.travis-ci.org/idontgetoutmuch/random.svg?branch=master)](http://travis-ci.org/idontgetoutmuch/random)
 
 This library provides a basic interface for (splittable) random number generators.
 
diff --git a/System/Random.hs b/System/Random.hs
index 828f3499d..34a721bca 100644
--- a/System/Random.hs
+++ b/System/Random.hs
@@ -224,6 +224,18 @@ import GHC.ForeignPtr
 import System.IO.Unsafe (unsafePerformIO)
 import qualified System.Random.SplitMix as SM
 
+#if !MIN_VERSION_primitive(0,7,0)
+import Data.Primitive.Types (Addr(..))
+
+mutableByteArrayContentsCompat mba =
+  case mutableByteArrayContents mba of
+    Addr addr# -> Ptr addr#
+#else
+mutableByteArrayContentsCompat = mutableByteArrayContents
+#endif
+mutableByteArrayContentsCompat :: MutableByteArray s -> Ptr Word8
+{-# INLINE mutableByteArrayContentsCompat #-}
+
 -- $setup
 -- >>> :{
 -- unBuildWord32 :: Word32 -> (Word16, Word16)
@@ -242,18 +254,6 @@ import qualified System.Random.SplitMix as SM
 -- buildWord64 w0 w1 = ((fromIntegral w1) `shiftL` 32) .|. (fromIntegral w0)
 -- :}
 
-#if !MIN_VERSION_primitive(0,7,0)
-import Data.Primitive.Types (Addr(..))
-
-mutableByteArrayContentsCompat mba =
-  case mutableByteArrayContents mba of
-    Addr addr# -> Ptr addr#
-#else
-mutableByteArrayContentsCompat = mutableByteArrayContents
-#endif
-mutableByteArrayContentsCompat :: MutableByteArray s -> Ptr Word8
-{-# INLINE mutableByteArrayContentsCompat #-}
-
 -- | The class 'RandomGen' provides a common interface to random number
 -- generators.
 {-# DEPRECATED next "Use genWord32[R] or genWord64[R]" #-}