diff --git a/bin/compile b/bin/compile
index 6aefdb280..5a41fef39 100755
--- a/bin/compile
+++ b/bin/compile
@@ -95,6 +95,14 @@ export LIBRARY_PATH=/app/.heroku/vendor/lib:$BUILD_DIR/.heroku/vendor/lib:/app/.
 export LD_LIBRARY_PATH=/app/.heroku/vendor/lib:$BUILD_DIR/.heroku/vendor/lib:/app/.heroku/python/lib
 export PKG_CONFIG_PATH=/app/.heroku/vendor/lib/pkg-config:$BUILD_DIR/.heroku/vendor/lib/pkg-config:/app/.heroku/python/lib/pkg-config
 
+# Add apt-related paths
+export LD_LIBRARY_PATH="$BUILD_DIR/.apt/usr/lib/x86_64-linux-gnu:$BUILD_DIR/.apt/usr/lib/i386-linux-gnu:$BUILD_DIR/.apt/usr/lib:$LD_LIBRARY_PATH"
+export LIBRARY_PATH="$BUILD_DIR/.apt/usr/lib/x86_64-linux-gnu:$BUILD_DIR/.apt/usr/lib/i386-linux-gnu:$BUILD_DIR/.apt/usr/lib:$LIBRARY_PATH"
+export INCLUDE_PATH="$BUILD_DIR/.apt/usr/include:$INCLUDE_PATH"
+export C_INCLUDE_PATH="$BUILD_DIR/.apt/usr/include:$C_INCLUDE_PATH"
+export CPLUS_INCLUDE_PATH="$BUILD_DIR/.apt/usr/include:$CPLUS_INCLUDE_PATH"
+export PKG_CONFIG_PATH="$BUILD_DIR/.apt/usr/lib/x86_64-linux-gnu/pkgconfig:$BUILD_DIR/.apt/usr/lib/i386-linux-gnu/pkgconfig:$BUILD_DIR/.apt/usr/lib/pkgconfig:$PKG_CONFIG_PATH"
+
 # Switch to the repo's context.
 cd $BUILD_DIR
 
@@ -126,13 +134,15 @@ if [ ! -f runtime.txt ]; then
 fi
 
 # ### The Cache
+puts-step "Creating cache directory in $CACHE_DIR"
 mkdir -p $CACHE_DIR
+ls -l $CACHE_DIR
 
 # Purge "old-style" virtualenvs.
-bpwatch start clear_old_venvs
-  [ -d $CACHE_DIR/$LEGACY_TRIGGER ] && rm -fr $CACHE_DIR/.heroku/bin $CACHE_DIR/.heroku/lib $CACHE_DIR/.heroku/include
-  [ -d $CACHE_DIR/$VIRTUALENV_LOC ] && rm -fr $CACHE_DIR/.heroku/venv $CACHE_DIR/.heroku/src
-bpwatch stop clear_old_venvs
+#bpwatch start clear_old_venvs
+#  [ -d $CACHE_DIR/$LEGACY_TRIGGER ] && rm -fr $CACHE_DIR/.heroku/bin $CACHE_DIR/.heroku/lib $CACHE_DIR/.heroku/include
+#  [ -d $CACHE_DIR/$VIRTUALENV_LOC ] && rm -fr $CACHE_DIR/.heroku/venv $CACHE_DIR/.heroku/src
+#bpwatch stop clear_old_venvs
 
 # Restore old artifacts from the cache.
 bpwatch start restore_cache
@@ -166,22 +176,29 @@ source $BIN_DIR/steps/pylibmc
 # Libffi support.
 source $BIN_DIR/steps/cryptography
 
-# Install dependencies with Pip.
-sub-env $BIN_DIR/steps/pip-install
+# Numpy/scipy support
+source $BIN_DIR/steps/numpy-scipy
 
-# Django collectstatic support.
-sub-env $BIN_DIR/steps/collectstatic
+# Force scikit-learn to use a specific script
+source $BIN_DIR/steps/scikit-learn
 
+# Install dependencies with Pip.
+sub-env $BIN_DIR/steps/pip-install
 
 # ### Finalize
 #
 
+export LIBRARY_PATH=$LIBRARY_PATH:/app/vendor/libffi-3.0/lib
+export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/app/vendor/libffi-3.0/lib
+
+puts-step "Setting environment variables (LD_LIBRARY_PATH = $LD_LIBRARY_PATH)"
+
 # Set context environment variables.
 set-env PATH '$HOME/.heroku/python/bin:$PATH'
 set-env PYTHONUNBUFFERED true
 set-env PYTHONHOME /app/.heroku/python
-set-env LIBRARY_PATH /app/.heroku/vendor/lib:/app/.heroku/python/lib
-set-env LD_LIBRARY_PATH '/app/.heroku/vendor/lib:/app/.heroku/python/lib:$LD_LIBRARY_PATH'
+set-env LIBRARY_PATH /app/.heroku/vendor/lib:/app/.heroku/python/lib:/app/vendor/libffi-3.0/lib
+set-env LD_LIBRARY_PATH '/app/.heroku/vendor/lib:/app/.heroku/python/lib:/app/vendor/libffi-3.0/lib:$LD_LIBRARY_PATH'
 set-default-env LANG en_US.UTF-8
 set-default-env PYTHONHASHSEED random
 set-default-env PYTHONPATH /app/
diff --git a/bin/steps/numpy-scipy b/bin/steps/numpy-scipy
new file mode 100644
index 000000000..3d5434d7a
--- /dev/null
+++ b/bin/steps/numpy-scipy
@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+
+# This script serves as the Scipy/Numpy build step of the
+# [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python) 
+# compiler. 
+# 
+# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an 
+# adapter between a Python application and Heroku's runtime.
+#
+# This script is invoked by [`bin/compile`](/).
+
+VENDORED_GIT_NAME="npscipy-binaries"
+VENDORED_GIT_REPO="git://github.com/wyn/${VENDORED_GIT_NAME}.git"
+# The location of the pre-compiled atlas/lapack/blas/gfortran binaries.
+VENDORED_BINARIES="npscipy"
+# the location of the bdist of numpy
+VENDORED_NUMPY="numpy-1.7.0"
+# the location of the bdist of scipy
+VENDORED_SCIPY="scipy-0.11.0"
+
+# Syntax sugar.
+source $BIN_DIR/utils
+
+# If numpy or scipy exists within requirements.txt then use binaries.
+if (grep -iq -e "numpy" -e "scipy" requirements.txt) then
+  puts-step "Noticed numpy/scipy. Bootstrapping prebuilt binaries."
+  cd .heroku
+
+  ## check whether this has happened already
+  ## set BLAS/LAPACK/ATLAS
+  if [ -d "vendor/lib/atlas-base" ]; then
+    puts-step "Using cached binaries."
+  else
+    puts-step "Creating/downloading binaries."
+    # Download and extract everything into target vendor directory.
+    git clone ${VENDORED_GIT_REPO} > /dev/null
+    tar -xvf ${VENDORED_GIT_NAME}/${VENDORED_BINARIES}.tar.gz > /dev/null
+  fi
+  export BLAS=$(pwd)/vendor/lib/atlas-base/atlas/libblas.a
+  export LAPACK=$(pwd)/vendor/lib/atlas-base/atlas/liblapack.a
+  export ATLAS=$(pwd)/vendor/lib/atlas-base/libatlas.a
+  export LIBRARY_PATH=$LIBRARY_PATH:$(pwd)/vendor/lib:$(pwd)/vendor/lib/atlas-base:$(pwd)/vendor/lib/atlas-base/atlas
+  export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$(pwd)/vendor/lib:$(pwd)/vendor/lib/atlas-base:$(pwd)/vendor/lib/atlas-base/atlas
+
+  if [ -d "python/lib/python2.7/site-packages/numpy" ]; then
+    puts-step "Using cached numpy."
+  else
+    puts-step "Creating/downloading numpy bdist."
+    tar -xvf ${VENDORED_GIT_NAME}/${VENDORED_NUMPY}.tar.gz > /dev/null
+  fi
+  
+  if [ -d "python/lib/python2.7/site-packages/scipy" ]; then
+    puts-step "Using cached scipy."
+  else
+    puts-step "Creating/downloading scipy bdist."
+    tar -xvf ${VENDORED_GIT_NAME}/${VENDORED_SCIPY}.tar.gz > /dev/null
+  fi
+
+  # Move everything from venv directory to python directory
+  if [ -d "venv" ]; then
+    cp -a venv/* python/
+    rm -r venv
+  fi
+
+  if [ -d ${VENDORED_GIT_NAME} ]; then
+    rm -rf ${VENDORED_GIT_NAME}
+  fi
+  cd ..
+fi
diff --git a/bin/steps/pip-install b/bin/steps/pip-install
index 05b97ab78..356179f4c 100755
--- a/bin/steps/pip-install
+++ b/bin/steps/pip-install
@@ -5,6 +5,9 @@ source $BIN_DIR/utils
 # Install dependencies with Pip.
 puts-step "Installing dependencies with pip"
 
+echo $LIBRARY_PATH
+echo $INCLUDE_PATH
+
 [ ! "$FRESH_PYTHON" ] && bpwatch start pip_install
 [ "$FRESH_PYTHON" ] && bpwatch start pip_install_first
 
diff --git a/bin/steps/scikit-learn b/bin/steps/scikit-learn
new file mode 100644
index 000000000..c6ec9b125
--- /dev/null
+++ b/bin/steps/scikit-learn
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+# This script serves as the Skikit-learn build step of the
+# [**Python Buildpack**](https://github.com/heroku/heroku-buildpack-python) 
+# compiler. 
+# 
+# A [buildpack](http://devcenter.heroku.com/articles/buildpacks) is an 
+# adapter between a Python application and Heroku's runtime.
+#
+# This script is invoked by [`bin/compile`](/).
+
+# Syntax sugar.
+source $BIN_DIR/utils
+
+# If skikit-learn exists within requirements.txt then use binaries.
+if (grep -iq -e "^\s*scikit-learn" requirements.txt) then
+  TARGET_SKLEARN_VERSION=$(cat requirements.txt | grep scikit-learn | tr -d " " | cut -c 13-)
+  puts-step "Noticed scikit-learn. Installing..."
+  cd .heroku
+
+  ## check whether this has happened already
+
+  if [ -d "python/lib/python2.7/site-packages/scikit-learn*" ]; then
+    puts-step "Using cached scikit-learn."
+  else
+    puts-step "Installing scikit-learn$TARGET_SKLEARN_VERSION via pip, but setting environment vars first."
+    export BLAS=$(pwd)/vendor/lib/atlas-base/atlas/libblas.a
+    export LAPACK=$(pwd)/vendor/lib/atlas-base/atlas/liblapack.a
+    export ATLAS=$(pwd)/vendor/lib/atlas-base/libatlas.a
+    export LIBRARY_PATH=$LIBRARY_PATH:$(pwd)/vendor/lib:$(pwd)/lib/atlas-base:$(pwd)/lib/atlas-base/atlas
+    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$(pwd)/vendor/lib:$(pwd)/vendor/lib/atlas-base:$(pwd)/vendor/lib/atlas-base/atlas
+
+    pip install --use-mirrors scikit-learn$TARGET_SKLEARN_VERSION
+  fi
+
+  cd ..
+
+fi