diff --git a/pkgs/development/python-modules/generic/default.nix b/pkgs/development/python-modules/generic/default.nix
index 4e0b61002316..6e8794103bc2 100644
--- a/pkgs/development/python-modules/generic/default.nix
+++ b/pkgs/development/python-modules/generic/default.nix
@@ -20,6 +20,20 @@
 , installCommand ?
     ''
       easy_install --prefix="$out" .
+
+      # A pth file might have been generated to load the package from
+      # within its own site-packages, rename this package not to
+      # collide with others.
+      eapth="$out/lib/${python.libPrefix}"/site-packages/easy-install.pth
+      if [ -e "$eapth" ]; then
+          # move colliding easy_install.pth to specifically named one
+          mv "$eapth" $(dirname "$eapth")/${name}.pth
+      fi
+
+      # Remove any site.py files generated by easy_install as these
+      # cause collisions. If pth files are to be processed a
+      # corresponding site.py needs to be included in the PYTHONPATH.
+      rm -f "$out/lib/${python.libPrefix}"/site-packages/site.py*
     ''
     
 , buildPhase ? "true"
@@ -45,6 +59,8 @@ python.stdenv.mkDerivation (attrs // {
 
   buildInputs = [ python wrapPython setuptools ] ++ buildInputs ++ pythonPath;
 
+  buildInputStrings = map toString buildInputs;
+
   pythonPath = [ setuptools] ++ pythonPath;
 
   # XXX: Should we run `easy_install --always-unzip'?  It doesn't seem
@@ -62,7 +78,7 @@ python.stdenv.mkDerivation (attrs // {
   postFixup =
     ''
       wrapPythonPrograms
-    
+
       # If a user installs a Python package, she probably also wants its
       # dependencies in the user environment (since Python modules don't
       # have something like an RPATH, so the only way to find the
@@ -70,5 +86,12 @@ python.stdenv.mkDerivation (attrs // {
       if test -e $out/nix-support/propagated-build-inputs; then
           ln -s $out/nix-support/propagated-build-inputs $out/nix-support/propagated-user-env-packages
       fi
+
+      createBuildInputsPth build-inputs "$buildInputStrings"
+      for inputsfile in propagated-build-inputs propagated-build-native-inputs; do
+        if test -e $out/nix-support/$inputsfile; then
+            createBuildInputsPth $inputsfile "$(cat $out/nix-support/$inputsfile)"
+        fi
+      done
     '';
 })
diff --git a/pkgs/development/python-modules/generic/wrap.sh b/pkgs/development/python-modules/generic/wrap.sh
index 65f3229ca7c4..71269945d6f4 100644
--- a/pkgs/development/python-modules/generic/wrap.sh
+++ b/pkgs/development/python-modules/generic/wrap.sh
@@ -45,3 +45,16 @@ _addToPythonPath() {
         done
     fi
 }
+
+createBuildInputsPth() {
+    local category="$1"
+    local inputs="$2"
+    if [ foo"$inputs" != foo ]; then
+        for x in $inputs; do
+            if test -d "$x"/lib/@libPrefix@/site-packages; then
+                echo $x/lib/@libPrefix@/site-packages \
+                    >> "$out"/lib/@libPrefix@/site-packages/${name}-nix-python-$category.pth
+            fi
+        done
+    fi
+}